void TIFFCIELabToXYZ	(	TIFFCIELabToRGB *	cielab,
		uint32	l,
		int32	a,
		int32	b,
		float *	X,
		float *	Y,
		float *	Z
	)

Definition at line 46 of file tif_color.c.

Referenced by DECLAREContigPutFunc().

{
    float L = (float)l * 100.0F / 255.0F;
    float cby, tmp;

    if( L < 8.856F ) {
        *Y = (L * cielab->Y0) / 903.292F;
        cby = 7.787F * (*Y / cielab->Y0) + 16.0F / 116.0F;
    } else {
        cby = (L + 16.0F) / 116.0F;
        *Y = cielab->Y0 * cby * cby * cby;
    }

    tmp = (float)a / 500.0F + cby;
    if( tmp < 0.2069F )
        *X = cielab->X0 * (tmp - 0.13793F) / 7.787F;
    else    
        *X = cielab->X0 * tmp * tmp * tmp;

    tmp = cby - (float)b / 200.0F;
    if( tmp < 0.2069F )
        *Z = cielab->Z0 * (tmp - 0.13793F) / 7.787F;
    else    
        *Z = cielab->Z0 * tmp * tmp * tmp;
}

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