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typedef unsigned long XcmsColorFormat;            /* Color Specification Format */
typedef struct {
    union {
        XcmsRGB RGB;
        XcmsRGBi RGBi;
        XcmsCIEXYZ CIEXYZ;
        XcmsCIEuvY CIEuvY;
        XcmsCIExyY CIExyY;
        XcmsCIELab CIELab;
        XcmsCIELuv CIELuv;
        XcmsTekHVC TekHVC;
        XcmsPad Pad;
    } spec;
    unsigned long pixel;
    XcmsColorFormat format;
} XcmsColor;            /* Xcms Color Structure */

typedef double XcmsFloat;
typedef struct {
    unsigned short red;    /* 0x0000 to 0xffff */
    unsigned short green;    /* 0x0000 to 0xffff */
    unsigned short blue;    /* 0x0000 to 0xffff */
} XcmsRGB;        /* RGB Device */

typedef struct {
    XcmsFloat red;    /* 0.0 to 1.0 */
    XcmsFloat green;    /* 0.0 to 1.0 */
    XcmsFloat blue;    /* 0.0 to 1.0 */
} XcmsRGBi;        /* RGB Intensity */

typedef struct {
    XcmsFloat X;
    XcmsFloat Y;    /* 0.0 to 1.0 */
    XcmsFloat Z;
} XcmsCIEXYZ;        /* CIE XYZ */

typedef struct {
    XcmsFloat u_prime;    /* 0.0 to ~0.6 */
    XcmsFloat v_prime;    /* 0.0 to ~0.6 */
    XcmsFloat Y;     /* 0.0 to 1.0 */
} XcmsCIEuvY;        /* CIE u'v'Y */

typedef struct {
    XcmsFloat x;     /* 0.0 to ~.75 */
    XcmsFloat y;     /* 0.0 to ~.85 */
    XcmsFloat Y;     /* 0.0 to 1.0 */
} XcmsCIExyY;        /* CIE xyY */

typedef struct {
    XcmsFloat L_star;     /* 0.0 to 100.0 */
    XcmsFloat a_star;
    XcmsFloat b_star;
} XcmsCIELab;        /* CIE L*a*b* */

typedef struct {
    XcmsFloat L_star;     /* 0.0 to 100.0 */
    XcmsFloat u_star;
    XcmsFloat v_star;
} XcmsCIELuv;        /* CIE L*u*v* */

typedef struct {
    XcmsFloat H;     /* 0.0 to 360.0 */
    XcmsFloat V;     /* 0.0 to 100.0 */
    XcmsFloat C;     /* 0.0 to 100.0 */
} XcmsTekHVC;        /* TekHVC */

typedef struct {
    XcmsFloat pad0;
    XcmsFloat pad1;
    XcmsFloat pad2;
    XcmsFloat pad3;
} XcmsPad;        /* four doubles */

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