QuickTime 4 API Documentation

QuickTime 4 Reference

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Color Structure

A color value, plus a specification of the color space it belongs to, constitute a color. A color is a structure defined by the gxColor type definition:



 
struct gxColor{

    gxColorSpace                space;

    gxColorProfile              profile;

    union {

            struct gxCMYKColor              cmyk;

            struct gxRGBColor               rgb;

            struct gxRGBAColor              rgba;

            struct gxHSVColor               hsv;

            struct gxHLSColor               hls;

            struct gxXYZColor               xyz;

            struct gxYXYColor               yxy;

            struct gxLUVColor               luv;

            struct gxLABColor               lab;

            struct gxYIQColor               yiq;

            gxColorValue                    gray;

            struct gxGrayAColor             graya;

            unsigned short                  pixel16;

            unsigned long                   pixel32;

            struct gxIndexedColor           indexed;

            gxColorValue                    component[4];

    } element;

};

Field descriptions

space: The color space for this color.
profile: For QuickTime vectors, this must be nil .
element: The color value for this color.
The element field is a union that can contain any one of the following fields:
cmyk: A CMYK color value.
rgb: An RGB color value.
rgba: An alpha-channel RGB color value.
hsv: An HSV color value.
hls: An HLS color value.
xyz: An XYZ color value.
yxy: A Yxy color value.
luv: An L*u*v* color value.
lab: An L*a*b* color value.
yiq: A YIQ color value.
gray: A grayscale color value
graya: An alpha-channel grayscale color value.
pixel16: A 16-bit pixel value, in gxRGB16Space format.
pixel32: A 32-bit pixel value, in any of the 32-bit color space formats.
indexed: Unused for QuickTime vectors.
component: An array of 4 undefined color-component values. Useful for indexing through the color one component at a time, as when working with different transfer modes for each color component.

© 1999 Apple Computer, Inc.

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