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## org.richfaces.renderkit.util
Class ColorUtils

    java.lang.Object
      org.richfaces.renderkit.util.ColorUtils

    public final class ColorUtils

extends Object

Utility methods that are useful for color processing.

Author:
  carcasser

Method Summary
`static Color` | `adjustBrightness(Color c, float difference)` Increases/decreases brightness of the given color by the specified `difference`.
`static Color` | `adjustLightness(Color c, float difference)` Increases/decreases lightness of the given color by the specified `difference`.
`static Color` | `convertHSLtoRGB(float h, float s, float l)` Converts the components of a color, as specified by the HSL model, to an equivalent set of values for the default RGB model.
`static float[]` | `convertRGBtoHSL(int r, int g, int b)` Converts the components of a color, as specified by the default RGB model, to an equivalent set of values for hue, saturation, and lightness that are the three components of the HSL model.
`static Color` | `overwriteAlpha(Color c, float alpha)` Overwrites alpha value for given color.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### convertRGBtoHSL

    public static float[] convertRGBtoHSL(int r,
                                          int g,
                                          int b)

  Converts the components of a color, as specified by the default RGB model, to an equivalent set of values for hue, saturation, and lightness that are the three components of the HSL model.

  Parameters:
    `r` - the red component of the color
    `g` - the green component of the color
    `b` - the blue component of the color
  Returns:
    an array of three elements containing the hue, saturation, and lightness (in that order), of the color with the indicated red, green, and blue components.

### convertHSLtoRGB

    public static Color convertHSLtoRGB(float h,
                                        float s,
                                        float l)

  Converts the components of a color, as specified by the HSL model, to an equivalent set of values for the default RGB model.

  The `saturation` and `lightness` components should be floating-point values between zero and one (numbers in the range 0.0-1.0). The `hue` component can be any floating-point number. The floor of this number is subtracted from it to create a fraction between 0 and 1. This fractional number is then multiplied by 360 to produce the hue angle in the HSB color model.

  Parameters:
    `h` - the hue component of the color
    `s` - the saturation of the color
    `l` - the lightness of the color
  Returns:
    the RGB value of the color with the indicated hue, saturation, and lightness

### adjustBrightness

    public static Color adjustBrightness(Color c,
                                         float difference)

  Increases/decreases brightness of the given color by the specified `difference`.

  The `difference` values in the range (-1.0, 1.0): 1.0 - the brightest value; -1.0 - the dimmest value.

  Parameters:
    `c` - color to adjust
    `difference` - value to be added to the current brightness
  Returns:
    a new `Color` instance with increased/decreased brightness by specified `difference`
  Throws:
    `IllegalArgumentException` - if difference is outside of the range -1.0 to 1.0, inclusive

### adjustLightness

    public static Color adjustLightness(Color c,
                                        float difference)

  Increases/decreases lightness of the given color by the specified `difference`.

  The `difference` values in the range (-1.0, 1.0): 1.0 - the lightest value; -1.0 - on the contrary.

  Parameters:
    `c` - color to adjust
    `difference` - value to be added to the current lightness
  Returns:
    a new `Color` instance with increased/decreased lightness by specified `difference`
  Throws:
    `IllegalArgumentException` - if difference is outside of the range -1.0 to 1.0, inclusive

### overwriteAlpha

    public static Color overwriteAlpha(Color c,
                                       float alpha)

  Overwrites alpha value for given color.

  Parameters:
    `c` - color to overwrite
    `alpha` - a new value of alpha
  Returns:
    a new `Color` object with a new specified alpha value

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