QColor Class Reference

The QColor class provides colors based on RGB, HSV or CMYK values.

  1. #include <QColor>

Detailed Description

The QColor class provides colors based on RGB, HSV or CMYK values.

A color is normally specified in terms of RGB (red, green, and blue) components, but it is also possible to specify it in terms of HSV (hue, saturation, and value) and CMYK (cyan, magenta, yellow and black) components. In addition a color can be specified using a color name. The color name can be any of the SVG 1.0 color names.

RGBHSVCMYK

The QColor constructor creates the color based on RGB values. To create a QColor based on either HSV or CMYK values, use the toHsv() and toCmyk() functions respectively. These functions return a copy of the color using the desired format. In addition the static fromRgb(), fromHsv() and fromCmyk() functions create colors from the specified values. Alternatively, a color can be converted to any of the three formats using the convertTo() function (returning a copy of the color in the desired format), or any of the setRgb(), setHsv() and setCmyk() functions altering this color's format. The spec() function tells how the color was specified.

A color can be set by passing an RGB string (such as "#112233"), or a color name (such as "blue"), to the setNamedColor() function. The color names are taken from the SVG 1.0 color names. The name() function returns the name of the color in the format "#RRGGBB". Colors can also be set using setRgb(), setHsv() and setCmyk(). To get a lighter or darker color use the lighter() and darker() functions respectively.

The isValid() function indicates whether a QColor is legal at all. For example, a RGB color with RGB values out of range is illegal. For performance reasons, QColor mostly disregards illegal colors, and for that reason, the result of using an invalid color is undefined.

The color components can be retrieved individually, e.g with red(), hue() and cyan(). The values of the color components can also be retrieved in one go using the getRgb(), getHsv() and getCmyk() functions. Using the RGB color model, the color components can in addition be accessed with rgb().

There are several related non-members: QRgb is a typdef for an unsigned int representing the RGB value triplet (r, g, b). Note that it also can hold a value for the alpha-channel (for more information, see the Alpha-Blended Drawing section). The qRed(), qBlue() and qGreen() functions return the respective component of the given QRgb value, while the qRgb() and qRgba() functions create and return the QRgb triplet based on the given component values. Finally, the qAlpha() function returns the alpha component of the provided QRgb, and the qGray() function calculates and return a gray value based on the given value.

QColor is platform and device independent. The QColormap class maps the color to the hardware.

For more information about painting in general, see the Paint System documentation.

Integer vs. Floating Point Precision

QColor supports floating point precision and provides floating point versions of all the color components functions, e.g. getRgbF(), hueF() and fromCmykF(). Note that since the components are stored using 16-bit integers, there might be minor deviations between the values set using, for example, setRgbF() and the values returned by the getRgbF() function due to rounding.

While the integer based functions take values in the range 0-255 (except hue() which must have values within the range 0-359), the floating point functions accept values in the range 0.0 - 1.0.

Alpha-Blended Drawing

QColor also support alpha-blended outlining and filling. The alpha channel of a color specifies the transparency effect, 0 represents a fully transparent color, while 255 represents a fully opaque color. For example:

  1. // Specify semi-transparent red
  2. painter.setBrush(QColor(255, 0, 0, 127));
  3. painter.drawRect(0, 0, width()/2, height());
  4.  
  5. // Specify semi-transparent blue
  6. painter.setBrush(QColor(0, 0, 255, 127));
  7. painter.drawRect(0, 0, width(), height()/2);

The code above produces the following output:

Alpha-blended drawing is supported on Windows, Mac OS X, and on X11 systems that have the X Render extension installed.

The alpha channel of a color can be retrieved and set using the alpha() and setAlpha() functions if its value is an integer, and alphaF() and setAlphaF() if its value is qreal (double). By default, the alpha-channel is set to 255 (opaque). To retrieve and set all the RGB color components (including the alpha-channel) in one go, use the rgba() and setRgba() functions.

Predefined Colors

There are 20 predefined QColors described by the Qt::GlobalColor enum, including black, white, primary and secondary colors, darker versions of these colors and three shades of gray. QColor also recognizes a variety of color names; the static colorNames() function returns a QStringList color names that QColor knows about.

Qt Colors

Qt Colors

Additionally, the Qt::color0, Qt::color1 and Qt::transparent colors are used for special purposes.

Qt::color0 (zero pixel value) and Qt::color1 (non-zero pixel value) are special colors for drawing in QBitmaps. Painting with Qt::color0 sets the bitmap bits to 0 (transparent; i.e., background), and painting with Qt::color1 sets the bits to 1 (opaque; i.e., foreground).

Qt::transparent is used to indicate a transparent pixel. When painting with this value, a pixel value will be used that is appropriate for the underlying pixel format in use.

The HSV Color Model

The RGB model is hardware-oriented. Its representation is close to what most monitors show. In contrast, HSV represents color in a way more suited to the human perception of color. For example, the relationships "stronger than", "darker than", and "the opposite of" are easily expressed in HSV but are much harder to express in RGB.

HSV, like RGB, has three components:

  • H, for hue, is in the range 0 to 359 if the color is chromatic (not gray), or meaningless if it is gray. It represents degrees on the color wheel familiar to most people. Red is 0 (degrees), green is 120, and blue is 240.

  • S, for saturation, is in the range 0 to 255, and the bigger it is, the stronger the color is. Grayish colors have saturation near 0; very strong colors have saturation near 255.

  • V, for value, is in the range 0 to 255 and represents lightness or brightness of the color. 0 is black; 255 is as far from black as possible.

Here are some examples: pure red is H=0, S=255, V=255; a dark red, moving slightly towards the magenta, could be H=350 (equivalent to -10), S=255, V=180; a grayish light red could have H about 0 (say 350-359 or 0-10), S about 50-100, and S=255.

Qt returns a hue value of -1 for achromatic colors. If you pass a hue value that is too large, Qt forces it into range. Hue 360 or 720 is treated as 0; hue 540 is treated as 180.

In addition to the standard HSV model, Qt provides an alpha-channel to feature alpha-blended drawing.

The HSL Color Model

HSL is similar to HSV. Instead of value parameter from HSV, HSL has the lightness parameter. The lightness parameter goes from black to color and from color to white. If you go outside at the night its black or dark gray. At day its colorful but if you look in a really strong light a things they are going to white and wash out.

The CMYK Color Model

While the RGB and HSV color models are used for display on computer monitors, the CMYK model is used in the four-color printing process of printing presses and some hard-copy devices.

CMYK has four components, all in the range 0-255: cyan (C), magenta (M), yellow (Y) and black (K). Cyan, magenta and yellow are called subtractive colors; the CMYK color model creates color by starting with a white surface and then subtracting color by applying the appropriate components. While combining cyan, magenta and yellow gives the color black, subtracting one or more will yield any other color. When combined in various percentages, these three colors can create the entire spectrum of colors.

Mixing 100 percent of cyan, magenta and yellow does produce black, but the result is unsatisfactory since it wastes ink, increases drying time, and gives a muddy colour when printing. For that reason, black is added in professional printing to provide a solid black tone; hence the term 'four color process'.

In addition to the standard CMYK model, Qt provides an alpha-channel to feature alpha-blended drawing.

See also QPalette, QBrush, and QApplication::setColorSpec().

Public Types

Toggle detailsenum QColor::

SpecSpec { Invalid , Rgb , Hsv , Cmyk , Hsl 4 ...} { Invalid , Rgb , Hsv , Cmyk , Hsl 4 }

The type of color specified, either RGB, HSV, CMYK or HSL.

ConstantValue
QColor::Rgb 1
QColor::Hsv 2
QColor::Cmyk 3
QColor::Hsl 4
QColor::Invalid 0

See also spec() and convertTo().

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    Public Functions

    Toggle details QColor

    QColorQColor () ()

    Constructs an invalid color with the RGB value (0, 0, 0). An invalid color is a color that is not properly set up for the underlying window system.

    The alpha value of an invalid color is unspecified.

    See also isValid().

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    Toggle details QColor

    QColorQColor ( int r , int g , int b , int a=255 ) ( int r , int g , int b , int a=255 )

    Constructs a color with the RGB value r, g, b, and the alpha-channel (transparency) value of a.

    The color is left invalid if any of the arguments are invalid.

    See also setRgba() and isValid().

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    Toggle details QColor

    QColorQColor ( QRgb color ) ( QRgb color )

    Constructs a color with the value color. The alpha component is ignored and set to solid.

    See also fromRgb() and isValid().

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    Toggle details QColor

    QColorQColor ( const QString &name ) ( const QString &name )

    Constructs a named color in the same way as setNamedColor() using the given name.

    The color is left invalid if the name cannot be parsed.

    See also setNamedColor(), name(), and isValid().

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    Toggle details QColor

    QColorQColor ( const char *name ) ( const char *name )

    Constructs a named color in the same way as setNamedColor() using the given name.

    The color is left invalid if the name cannot be parsed.

    See also setNamedColor(), name(), and isValid().

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    Toggle details QColor

    QColorQColor ( const QColor &color ) ( const QColor &color )

    Constructs a color that is a copy of color.

    See also isValid().

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    Toggle details QColor

    QColorQColor ( Qt::GlobalColor color ) ( Qt::GlobalColor color )

    This is an overloaded function.

    Constructs a new color with a color value of color.

    See also isValid() and Predefined Colors.

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    Toggle details bool QColor

    allowX11ColorNamesallowX11ColorNames () () [static]

    Returns true if setNamedColor() is allowed to look up colors in the X11 color database. By default, this function returns false.

    Note: This function is only available on the X11 platform.

    See also setAllowX11ColorNames().

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    Toggle details int QColor

    alphaalpha () ()const

    Returns the alpha color component of this color.

    See also setAlpha(), alphaF(), and Alpha-Blended Drawing.

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    Toggle details qreal QColor

    alphaFalphaF () ()const

    Returns the alpha color component of this color.

    See also setAlphaF(), alpha(), and Alpha-Blended Drawing.

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    Toggle details int QColor

    blackblack () ()const

    Returns the black color component of this color.

    See also blackF(), getCmyk(), and The CMYK Color Model.

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    Toggle details qreal QColor

    blackFblackF () ()const

    Returns the black color component of this color.

    See also black(), getCmykF(), and The CMYK Color Model.

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    Toggle details int QColor

    blueblue () ()const

    Returns the blue color component of this color.

    See also setBlue(), blueF(), and getRgb().

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    Toggle details qreal QColor

    blueFblueF () ()const

    Returns the blue color component of this color.

    See also setBlueF(), blue(), and getRgbF().

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    Toggle details QStringList QColor

    colorNamescolorNames () () [static]

    Returns a QStringList containing the color names Qt knows about.

    See also Predefined Colors.

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    Toggle details QColor QColor

    convertToconvertTo ( Spec colorSpec ) ( Spec colorSpec )const

    Creates a copy of this color in the format specified by colorSpec.

    See also spec(), toCmyk(), toHsv(), toRgb(), and isValid().

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    Toggle details int QColor

    cyancyan () ()const

    Returns the cyan color component of this color.

    See also cyanF(), getCmyk(), and The CMYK Color Model.

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    Toggle details qreal QColor

    cyanFcyanF () ()const

    Returns the cyan color component of this color.

    See also cyan(), getCmykF(), and The CMYK Color Model.

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    Toggle details QColor QColor

    darkerdarker ( int factor=200 ) ( int factor=200 )const

    Returns a darker (or lighter) color, but does not change this object.

    If the factor is greater than 100, this functions returns a darker color. Setting factor to 300 returns a color that has one-third the brightness. If the factor is less than 100, the return color is lighter, but we recommend using the lighter() function for this purpose. If the factor is 0 or negative, the return value is unspecified.

    The function converts the current RGB color to HSV, divides the value (V) component by factor and converts the color back to RGB.

    See also lighter() and isValid().

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    Toggle details QColor QColor

    fromCmykfromCmyk ( int c , int m , int y , int k , int a=255 ...) ( int c , int m , int y , int k , int a=255 ) [static]

    Static convenience function that returns a QColor constructed from the given CMYK color values: c (cyan), m (magenta), y (yellow), k (black), and a (alpha-channel, i.e. transparency).

    All the values must be in the range 0-255.

    See also toCmyk(), fromCmykF(), isValid(), and The CMYK Color Model.

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    Toggle details QColor QColor

    fromCmykFfromCmykF ( qreal c , qreal m , qreal y , qreal k , qreal a=1.0 ...) ( qreal c , qreal m , qreal y , qreal k , qreal a=1.0 ) [static]

    This is an overloaded function.

    Static convenience function that returns a QColor constructed from the given CMYK color values: c (cyan), m (magenta), y (yellow), k (black), and a (alpha-channel, i.e. transparency).

    All the values must be in the range 0.0-1.0.

    See also toCmyk(), fromCmyk(), isValid(), and The CMYK Color Model.

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    Toggle details QColor QColor

    fromHslfromHsl ( int h , int s , int l , int a=255 ) ( int h , int s , int l , int a=255 ) [static]

    Static convenience function that returns a QColor constructed from the HSV color values, h (hue), s (saturation), l (lightness), and a (alpha-channel, i.e. transparency).

    The value of s, l, and a must all be in the range 0-255; the value of h must be in the range 0-359.

    See also toHsl(), fromHslF(), and isValid().

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    Toggle details QColor QColor

    fromHslFfromHslF ( qreal h , qreal s , qreal l , qreal a=1.0 ...) ( qreal h , qreal s , qreal l , qreal a=1.0 ) [static]

    This is an overloaded function.

    Static convenience function that returns a QColor constructed from the HSV color values, h (hue), s (saturation), l (lightness), and a (alpha-channel, i.e. transparency).

    All the values must be in the range 0.0-1.0.

    See also toHsl(), fromHsl(), and isValid().

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    Toggle details QColor QColor

    fromHsvfromHsv ( int h , int s , int v , int a=255 ) ( int h , int s , int v , int a=255 ) [static]

    Static convenience function that returns a QColor constructed from the HSV color values, h (hue), s (saturation), v (value), and a (alpha-channel, i.e. transparency).

    The value of s, v, and a must all be in the range 0-255; the value of h must be in the range 0-359.

    See also toHsv(), fromHsvF(), isValid(), and The HSV Color Model.

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    Toggle details QColor QColor

    fromHsvFfromHsvF ( qreal h , qreal s , qreal v , qreal a=1.0 ...) ( qreal h , qreal s , qreal v , qreal a=1.0 ) [static]

    This is an overloaded function.

    Static convenience function that returns a QColor constructed from the HSV color values, h (hue), s (saturation), v (value), and a (alpha-channel, i.e. transparency).

    All the values must be in the range 0.0-1.0.

    See also toHsv(), fromHsv(), isValid(), and The HSV Color Model.

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    Toggle details QColor QColor

    fromRgbfromRgb ( QRgb rgb ) ( QRgb rgb ) [static]

    Static convenience function that returns a QColor constructed from the given QRgb value rgb.

    The alpha component of rgb is ignored (i.e. it is automatically set to 255), use the fromRgba() function to include the alpha-channel specified by the given QRgb value.

    See also fromRgba(), fromRgbF(), toRgb(), and isValid().

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    Toggle details QColor QColor

    fromRgbfromRgb ( int r , int g , int b , int a=255 ) ( int r , int g , int b , int a=255 ) [static]

    Static convenience function that returns a QColor constructed from the RGB color values, r (red), g (green), b (blue), and a (alpha-channel, i.e. transparency).

    All the values must be in the range 0-255.

    See also toRgb(), fromRgbF(), and isValid().

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    Toggle details QColor QColor

    fromRgbFfromRgbF ( qreal r , qreal g , qreal b , qreal a=1.0 ...) ( qreal r , qreal g , qreal b , qreal a=1.0 ) [static]

    Static convenience function that returns a QColor constructed from the RGB color values, r (red), g (green), b (blue), and a (alpha-channel, i.e. transparency).

    All the values must be in the range 0.0-1.0.

    See also fromRgb(), toRgb(), and isValid().

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    Toggle details QColor QColor

    fromRgbafromRgba ( QRgb rgba ) ( QRgb rgba ) [static]

    Static convenience function that returns a QColor constructed from the given QRgb value rgba.

    Unlike the fromRgb() function, the alpha-channel specified by the given QRgb value is included.

    See also fromRgb() and isValid().

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    Toggle details void QColor

    getCmykgetCmyk ( int *c , int *m , int *y , int *k , int *a=0 ...) ( int *c , int *m , int *y , int *k , int *a=0 )

    Sets the contents pointed to by c, m, y, k, and a, to the cyan, magenta, yellow, black, and alpha-channel (transparency) components of the color's CMYK value.

    These components can be retrieved individually using the cyan(), magenta(), yellow(), black() and alpha() functions.

    See also setCmyk() and The CMYK Color Model.

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    Toggle details void QColor

    getCmykFgetCmykF ( qreal *c , qreal *m , qreal *y , qreal *k , qreal *a=0 ...) ( qreal *c , qreal *m , qreal *y , qreal *k , qreal *a=0 )

    Sets the contents pointed to by c, m, y, k, and a, to the cyan, magenta, yellow, black, and alpha-channel (transparency) components of the color's CMYK value.

    These components can be retrieved individually using the cyanF(), magentaF(), yellowF(), blackF() and alphaF() functions.

    See also setCmykF() and The CMYK Color Model.

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    Toggle details void QColor

    getHslgetHsl ( int *h , int *s , int *l , int *a=0 ) ( int *h , int *s , int *l , int *a=0 )const

    Sets the contents pointed to by h, s, l, and a, to the hue, saturation, lightness, and alpha-channel (transparency) components of the color's HSL value.

    These components can be retrieved individually using the hueHsl(), saturationHsl(), lightness() and alpha() functions.

    See also setHsl().

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    Toggle details void QColor

    getHslFgetHslF ( qreal *h , qreal *s , qreal *l , qreal *a=0 ...) ( qreal *h , qreal *s , qreal *l , qreal *a=0 )const

    Sets the contents pointed to by h, s, l, and a, to the hue, saturation, lightness, and alpha-channel (transparency) components of the color's HSL value.

    These components can be retrieved individually using the hueHslF(), saturationHslF(), lightnessF() and alphaF() functions.

    See also setHsl().

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    Toggle details void QColor

    getHsvgetHsv ( int *h , int *s , int *v , int *a=0 ) ( int *h , int *s , int *v , int *a=0 )const

    Sets the contents pointed to by h, s, v, and a, to the hue, saturation, value, and alpha-channel (transparency) components of the color's HSV value.

    These components can be retrieved individually using the hue(), saturation(), value() and alpha() functions.

    See also setHsv() and The HSV Color Model.

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    Toggle details void QColor

    getHsvFgetHsvF ( qreal *h , qreal *s , qreal *v , qreal *a=0 ...) ( qreal *h , qreal *s , qreal *v , qreal *a=0 )const

    Sets the contents pointed to by h, s, v, and a, to the hue, saturation, value, and alpha-channel (transparency) components of the color's HSV value.

    These components can be retrieved individually using the hueF(), saturationF(), valueF() and alphaF() functions.

    See also setHsv() and The HSV Color Model.

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    Toggle details void QColor

    getRgbgetRgb ( int *r , int *g , int *b , int *a=0 ) ( int *r , int *g , int *b , int *a=0 )const

    Sets the contents pointed to by r, g, b, and a, to the red, green, blue, and alpha-channel (transparency) components of the color's RGB value.

    These components can be retrieved individually using the red(), green(), blue() and alpha() functions.

    See also rgb() and setRgb().

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    Toggle details void QColor

    getRgbFgetRgbF ( qreal *r , qreal *g , qreal *b , qreal *a=0 ...) ( qreal *r , qreal *g , qreal *b , qreal *a=0 )const

    Sets the contents pointed to by r, g, b, and a, to the red, green, blue, and alpha-channel (transparency) components of the color's RGB value.

    These components can be retrieved individually using the redF(), greenF(), blueF() and alphaF() functions.

    See also rgb() and setRgb().

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    Toggle details int QColor

    greengreen () ()const

    Returns the green color component of this color.

    See also setGreen(), greenF(), and getRgb().

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    Toggle details qreal QColor

    greenFgreenF () ()const

    Returns the green color component of this color.

    See also setGreenF(), green(), and getRgbF().

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    Toggle details int QColor

    hslHuehslHue () ()const

    Returns the hue color component of this color.

    See also getHslF() and getHsl().

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    Toggle details qreal QColor

    hslHueFhslHueF () ()const

    Returns the hue color component of this color.

    See also hue() and getHslF().

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    Toggle details int QColor

    hslSaturationhslSaturation () ()const

    Returns the saturation color component of this color.

    See also saturationF(), getHsv(), and The HSV Color Model.

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    Toggle details qreal QColor

    hslSaturationFhslSaturationF () ()const

    Returns the saturation color component of this color.

    See also saturationF() and getHslF().

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    Toggle details int QColor

    hsvHuehsvHue () ()const

    Returns the hue color component of this color.

    See also hueF(), getHsv(), and The HSV Color Model.

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    Toggle details qreal QColor

    hsvHueFhsvHueF () ()const

    Returns the hue color component of this color.

    See also hue(), getHsvF(), and The HSV Color Model.

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    Toggle details int QColor

    hsvSaturationhsvSaturation () ()const

    Returns the saturation color component of this color.

    See also saturationF(), getHsv(), and The HSV Color Model.

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    Toggle details qreal QColor

    hsvSaturationFhsvSaturationF () ()const

    Returns the saturation color component of this color.

    See also saturation(), getHsvF(), and The HSV Color Model.

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    Toggle details int QColor

    huehue () ()const

    Returns the hue color component of this color.

    The color is implicitly converted to HSV.

    See also hsvHue(), hueF(), getHsv(), and The HSV Color Model.

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    Toggle details qreal QColor

    hueFhueF () ()const

    Returns the hue color component of this color.

    The color is implicitly converted to HSV.

    See also hsvHueF(), hue(), getHsvF(), and The HSV Color Model.

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    Toggle details bool QColor

    isValidisValid () ()const

    Returns true if the color is valid; otherwise returns false.

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    Toggle details bool QColor

    isValidColorisValidColor ( const QString &name ) ( const QString &name ) [static]

    Returns true if the name is a valid color name and can be used to construct a valid QColor object, otherwise returns false.

    It uses the same algorithm used in setNamedColor().

    See also setNamedColor().

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    Toggle details QColor QColor

    lighterlighter ( int factor=150 ) ( int factor=150 )const

    Returns a lighter (or darker) color, but does not change this object.

    If the factor is greater than 100, this functions returns a lighter color. Setting factor to 150 returns a color that is 50% brighter. If the factor is less than 100, the return color is darker, but we recommend using the darker() function for this purpose. If the factor is 0 or negative, the return value is unspecified.

    The function converts the current RGB color to HSV, multiplies the value (V) component by factor and converts the color back to RGB.

    See also darker() and isValid().

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    Toggle details int QColor

    lightnesslightness () ()const

    Returns the lightness color component of this color.

    See also lightnessF() and getHsl().

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    Toggle details qreal QColor

    lightnessFlightnessF () ()const

    Returns the lightness color component of this color.

    See also value() and getHslF().

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    Toggle details int QColor

    magentamagenta () ()const

    Returns the magenta color component of this color.

    See also magentaF(), getCmyk(), and The CMYK Color Model.

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    Toggle details qreal QColor

    magentaFmagentaF () ()const

    Returns the magenta color component of this color.

    See also magenta(), getCmykF(), and The CMYK Color Model.

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    Toggle details QString QColor

    namename () ()const

    Returns the name of the color in the format "#RRGGBB"; i.e. a "#" character followed by three two-digit hexadecimal numbers.

    See also setNamedColor().

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    Toggle details int QColor

    redred () ()const

    Returns the red color component of this color.

    See also setRed(), redF(), and getRgb().

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    Toggle details qreal QColor

    redFredF () ()const

    Returns the red color component of this color.

    See also setRedF(), red(), and getRgbF().

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    Toggle details QRgb QColor

    rgbrgb () ()const

    Returns the RGB value of the color. The alpha value is opaque.

    See also setRgb(), getRgb(), and rgba().

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    Toggle details QRgb QColor

    rgbargba () ()const

    Returns the RGB value of the color, including its alpha.

    For an invalid color, the alpha value of the returned color is unspecified.

    See also setRgba() and rgb().

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    Toggle details int QColor

    saturationsaturation () ()const

    Returns the saturation color component of this color.

    The color is implicitly converted to HSV.

    See also hsvSaturation(), saturationF(), getHsv(), and The HSV Color Model.

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    Toggle details qreal QColor

    saturationFsaturationF () ()const

    Returns the saturation color component of this color.

    The color is implicitly converted to HSV.

    See also hsvSaturationF(), saturation(), getHsvF(), and The HSV Color Model.

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    Toggle details void QColor

    setAllowX11ColorNamessetAllowX11ColorNames ( bool enabled ) ( bool enabled ) [static]

    Allow setNamedColor() to look up colors in the X11 color database if enabled. By default, setNamedColor() does not look up colors in the X11 color database.

    Note: This function is only available on the X11 platform.

    See also setNamedColor() and allowX11ColorNames().

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    Toggle details void QColor

    setAlphasetAlpha ( int alpha ) ( int alpha )

    Sets the alpha of this color to alpha. Integer alpha is specified in the range 0-255.

    See also alpha(), alphaF(), and Alpha-Blended Drawing.

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    Toggle details void QColor

    setAlphaFsetAlphaF ( qreal alpha ) ( qreal alpha )

    Sets the alpha of this color to alpha. qreal alpha is specified in the range 0.0-1.0.

    See also alphaF(), alpha(), and Alpha-Blended Drawing.

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    Toggle details void QColor

    setBluesetBlue ( int blue ) ( int blue )

    Sets the blue color component of this color to blue. Integer components are specified in the range 0-255.

    See also blue(), blueF(), and setRgb().

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    Toggle details void QColor

    setBlueFsetBlueF ( qreal blue ) ( qreal blue )

    Sets the blue color component of this color to blue. Float components are specified in the range 0.0-1.0.

    See also blueF(), blue(), and setRgbF().

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    Toggle details void QColor

    setCmyksetCmyk ( int c , int m , int y , int k , int a=255 ...) ( int c , int m , int y , int k , int a=255 )

    Sets the color to CMYK values, c (cyan), m (magenta), y (yellow), k (black), and a (alpha-channel, i.e. transparency).

    All the values must be in the range 0-255.

    See also getCmyk(), setCmykF(), and The CMYK Color Model.

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    Toggle details void QColor

    setCmykFsetCmykF ( qreal c , qreal m , qreal y , qreal k , qreal a=1.0 ...) ( qreal c , qreal m , qreal y , qreal k , qreal a=1.0 )

    This is an overloaded function.

    Sets the color to CMYK values, c (cyan), m (magenta), y (yellow), k (black), and a (alpha-channel, i.e. transparency).

    All the values must be in the range 0.0-1.0.

    See also getCmykF(), setCmyk(), and The CMYK Color Model.

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    Toggle details void QColor

    setGreensetGreen ( int green ) ( int green )

    Sets the green color component of this color to green. Integer components are specified in the range 0-255.

    See also green(), greenF(), and setRgb().

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    Toggle details void QColor

    setGreenFsetGreenF ( qreal green ) ( qreal green )

    Sets the green color component of this color to green. Float components are specified in the range 0.0-1.0.

    See also greenF(), green(), and setRgbF().

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    Toggle details void QColor

    setHslsetHsl ( int h , int s , int l , int a=255 ) ( int h , int s , int l , int a=255 )

    Sets a HSL color value; h is the hue, s is the saturation, l is the lightness and a is the alpha component of the HSL color.

    The saturation, value and alpha-channel values must be in the range 0-255, and the hue value must be greater than -1.

    See also getHsl() and setHslF().

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    Toggle details void QColor

    setHslFsetHslF ( qreal h , qreal s , qreal l , qreal a=1.0 ...) ( qreal h , qreal s , qreal l , qreal a=1.0 )

    Sets a HSL color lightness; h is the hue, s is the saturation, l is the lightness and a is the alpha component of the HSL color.

    All the values must be in the range 0.0-1.0.

    See also getHslF() and setHsl().

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    Toggle details void QColor

    setHsvsetHsv ( int h , int s , int v , int a=255 ) ( int h , int s , int v , int a=255 )

    Sets a HSV color value; h is the hue, s is the saturation, v is the value and a is the alpha component of the HSV color.

    The saturation, value and alpha-channel values must be in the range 0-255, and the hue value must be greater than -1.

    See also hsv(), getHsv(), setHsvF(), and The HSV Color Model.

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    Toggle details void QColor

    setHsvFsetHsvF ( qreal h , qreal s , qreal v , qreal a=1.0 ...) ( qreal h , qreal s , qreal v , qreal a=1.0 )

    Sets a HSV color value; h is the hue, s is the saturation, v is the value and a is the alpha component of the HSV color.

    All the values must be in the range 0.0-1.0.

    See also getHsvF(), setHsv(), and The HSV Color Model.

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    Toggle details void QColor

    setNamedColorsetNamedColor ( const QString &name ) ( const QString &name )

    Sets the RGB value of this QColor to name, which may be in one of these formats:

    • #RGB (each of R, G, and B is a single hex digit)
    • #RRGGBB
    • #RRRGGGBBB
    • #RRRRGGGGBBBB
    • A name from the list of colors defined in the list of SVG color keyword names provided by the World Wide Web Consortium; for example, "steelblue" or "gainsboro". These color names work on all platforms. Note that these color names are not the same as defined by the Qt::GlobalColor enums, e.g. "green" and Qt::green does not refer to the same color.
    • transparent - representing the absence of a color.
    • X11 only: If allowX11ColorNames() returns true, any valid X11 color name. See the documentation for XParseColor() for information about valid X11 color names.

    The color is invalid if name cannot be parsed.

    See also QColor(), name(), isValid(), and allowX11ColorNames().

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    Toggle details void QColor

    setRedsetRed ( int red ) ( int red )

    Sets the red color component of this color to red. Integer components are specified in the range 0-255.

    See also red(), redF(), and setRgb().

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    Toggle details void QColor

    setRedFsetRedF ( qreal red ) ( qreal red )

    Sets the red color component of this color to red. Float components are specified in the range 0.0-1.0.

    See also redF(), red(), and setRgbF().

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    Toggle details void QColor

    setRgbsetRgb ( int r , int g , int b , int a=255 ) ( int r , int g , int b , int a=255 )

    Sets the RGB value to r, g, b and the alpha value to a.

    All the values must be in the range 0-255.

    See also rgb(), getRgb(), and setRgbF().

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    Toggle details void QColor

    setRgbsetRgb ( QRgb rgb ) ( QRgb rgb )

    This is an overloaded function.

    Sets the RGB value to rgb. The alpha value is set to opaque.

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    Toggle details void QColor

    setRgbFsetRgbF ( qreal r , qreal g , qreal b , qreal a=1.0 ...) ( qreal r , qreal g , qreal b , qreal a=1.0 )

    Sets the color channels of this color to r (red), g (green), b (blue) and a (alpha, transparency).

    All values must be in the range 0.0-1.0.

    See also rgb(), getRgbF(), and setRgb().

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    Toggle details void QColor

    setRgbasetRgba ( QRgb rgba ) ( QRgb rgba )

    Sets the RGB value to rgba, including its alpha.

    See also rgba() and rgb().

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    Toggle details Spec QColor

    specspec () ()const

    Returns how the color was specified.

    See also Spec and convertTo().

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    Toggle details QColor QColor

    toCmyktoCmyk () ()const

    Creates and returns a CMYK QColor based on this color.

    See also fromCmyk(), convertTo(), isValid(), and The CMYK Color Model.

    Look up this member in the source code.

    Toggle details QColor QColor

    toHsltoHsl () ()const

    Creates and returns an HSL QColor based on this color.

    See also fromHsl(), convertTo(), and isValid().

    Look up this member in the source code.

    Toggle details QColor QColor

    toHsvtoHsv () ()const

    Creates and returns an HSV QColor based on this color.

    See also fromHsv(), convertTo(), isValid(), and The HSV Color Model.

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    Toggle details QColor QColor

    toRgbtoRgb () ()const

    Create and returns an RGB QColor based on this color.

    See also fromRgb(), convertTo(), and isValid().

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    Toggle details int QColor

    valuevalue () ()const

    Returns the value color component of this color.

    See also valueF(), getHsv(), and The HSV Color Model.

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    Toggle details qreal QColor

    valueFvalueF () ()const

    Returns the value color component of this color.

    See also value(), getHsvF(), and The HSV Color Model.

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    Toggle details int QColor

    yellowyellow () ()const

    Returns the yellow color component of this color.

    See also yellowF(), getCmyk(), and The CMYK Color Model.

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    Toggle details qreal QColor

    yellowFyellowF () ()const

    Returns the yellow color component of this color.

    See also yellow(), getCmykF(), and The CMYK Color Model.

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    Toggle details QColor

    operator QVariantoperator QVariant () ()const

    Returns the color as a QVariant

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    Toggle details bool QColor

    operator!=operator!= ( const QColor &color ) ( const QColor &color )const

    Returns true if this color has a different RGB and alpha values from color; otherwise returns false.

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    Toggle details QColor & QColor

    operator=operator= ( const QColor &color ) ( const QColor &color )

    Assigns a copy of color to this color, and returns a reference to it.

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    Toggle details QColor & QColor

    operator=operator= ( Qt::GlobalColor color ) ( Qt::GlobalColor color )

    This is an overloaded function.

    Assigns a copy of color and returns a reference to this color.

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    Toggle details bool QColor

    operator==operator== ( const QColor &color ) ( const QColor &color )const

    Returns true if this color has the same RGB and alpha values as color; otherwise returns false.

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    Toggle details QColor QColor

    darkdark ( int factor=200 ) ( int factor=200 )const Obsolete function

    Use darker(factor) instead.

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    Toggle details QColor QColor

    lightlight ( int factor=150 ) ( int factor=150 )const Obsolete function

    Use lighter(factor) instead.

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    Toggle details QColor

    QColorQColor ( int x , int y , int z , Spec colorSpec ) ( int x , int y , int z , Spec colorSpec ) Qt3-support

    Use one of the other QColor constructors, or one of the static convenience functions, instead.

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    Toggle details void QColor

    getRgbagetRgba ( int *r , int *g , int *b , int *a ) ( int *r , int *g , int *b , int *a )const Qt3-support

    Use getRgb() instead.

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    Toggle details void QColor

    hsvhsv ( int *h , int *s , int *v ) ( int *h , int *s , int *v )const Qt3-support

    Use getHsv() instead.

    See also setHsv().

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    Toggle details uint QColor

    pixelpixel ( int screen=-1 ) ( int screen=-1 )const Qt3-support

    Returns the pixel value used by the underlying window system to refer to a color.

    Use QColormap::pixel() instead.

    For example, if you have code like

    1. QColor myColor;
    2. uint pixel = myColor.pixel(screen);

    you can rewrite it as

    1.                     QColormap cmap = QColormap::instance(screen);
    2. uint pixel  = cmap.pixel(*this);

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    Toggle details void QColor

    rgbrgb ( int *r , int *g , int *b ) ( int *r , int *g , int *b )const Qt3-support

    Use getRgb() instead.

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    Toggle details void QColor

    setRgbasetRgba ( int r , int g , int b , int a ) ( int r , int g , int b , int a ) Qt3-support

    Use setRgb() instead.

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    Notes provided by the Qt Community

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