Hello,
I just tried to use Little CMS as an alternative to the Kodak CMS API,
but I encounter some weird problems.
Here is a very simple code that I don't succeeded in making it working.
void Test(void)
{
double XYZ[3]={0.964220,1.0,0.8249};
double Lab[3]={100.0,0.0,0.0};
short
sXYZ[3]={(short)(0.964220*32768+0.5),(short)(32768+0.5),(short)(0.82521*
32768+0.5)};
char RGB[3];
cmsHTRANSFORM Trans;
memset(RGB,0,3);
Trans=cmsCreateTransform(cmsCreateXYZProfile(),TYPE_XYZ_DBL,cmsCreate_sR
GBProfile(),TYPE_RGB_8,0,0);
cmsDoTransform(Trans,XYZ,RGB,1);
cmsDeleteTransform(Trans);
memset(RGB,0,3);
Trans=cmsCreateTransform(cmsCreateXYZProfile(),TYPE_XYZ_16,cmsCreate_sRG
BProfile(),TYPE_RGB_8,0,0);
cmsDoTransform(Trans,sXYZ,RGB,1);
cmsDeleteTransform(Trans);
memset(RGB,0,3);
Trans=cmsCreateTransform(cmsCreateLabProfile(NULL),TYPE_Lab_DBL,cmsCreat
e_sRGBProfile(),TYPE_RGB_8,0,0);
cmsDoTransform(Trans,Lab,RGB,1);
cmsDeleteTransform(Trans);
}
The goal is simply to get RGB values for the D50 illuminant (normally
255,255,255). It works when creating transform using Lab as input
profile (third case), but it does not work for XYZ versions (first two
cases with double and 16 bit values).
Why I can not get right RGB values when working in XYZ (249 253 253
instead of 255 255 255) ? I verified that these XYZ values are converted
to 100, 0, 0 lab values when using functions like cmsXYZ2Lab.
I use LCMS 1.16 with visual 2005.
J.
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