Inside Macintosh: QuickDraw GX Objects /

Chapter 4 - Colors and Color-Related Objects / Colors and Color-Related Objects Reference

Constants and Data Types

Color Spaces

A color space defines how a color value is represented. Each color space specifies the number, order, and size of the color-component values that make up a color value in that space. QuickDraw GX recognizes 31 color spaces, defined in the gxColorSpace enumeration:

enum gxColorSpaces{
   gxNoSpace      = 0,
   gxRGBSpace,
   gxCMYKSpace,
   gxHSVSpace,
   gxHLSSpace,
   gxYXYSpace,
   gxXYZSpace,
   gxLUVSpace,
   gxLABSpace,
   gxYIQSpace,
   gxNTSCSpace    = gxYIQSpace,
   gxPALSpace     = gxYIQSpace,
   gxGraySpace,
   gxIndexedSpace,
   gxRGBASpace    = gxRGBSpace + gxAlphaSpace,
   gxGrayASpace   = gxGraySpace + gxAlphaSpace,
   gxRGB16Space   = gxWord5ColorPacking + gxRGBSpace,
   gxRGB32Space   = gxLong8ColorPacking + gxRGBSpace,
   gxARGB32Space  = gxLong8ColorPacking + gxAlphaFirstPacking 
                     + gxRGBASpace,
   gxCMYK32Space  = gxLong8ColorPacking + gxCMYKSpace,
   gxHSV32Space   = gxLong10ColorPacking + gxHSVSpace,
   gxHLS32Space   = gxLong10ColorPacking + gxHLSSpace,
   gxYXY32Space   = gxLong10ColorPacking + gxYXYSpace,
   gxXYZ32Space   = gxLong10ColorPacking + gxXYZSpace,
   gxLUV32Space   = gxLong10ColorPacking + gxLUVSpace,
   gxLAB32Space   = gxLong10ColorPacking + gxLABSpace,
   gxYIQ32Space   = gxLong10ColorPacking + gxYIQSpace,
   gxNTSC32Space  = gxYIQ32Space,
   gxPAL32Space   = gxYIQ32Space,
};

typedef long gxColorSpace;

Note that color spaces from gxRGBASpace through gxYIQ32Space use color-packing flags in their definitions. Those flags are described in the previous section, "Color Packing."

The individual color spaces are described in the section "Color Spaces" beginning on page 4-6.