Dear Marti,
I would like to thank you again for your help. However I would like to add a
very small correction to your code. This code would only work with me if it
is look like this:
const cmsToneCurve **Vcgt; // please note the variable declaration
Vcgt= (const cmsToneCurve**)cmsReadTag(hProfile, cmsSigVcgtTag); // please
note the typecasting
cmsFloat32Number r,g,b;
if (Vcgt != NULL){
for (int i=0; i < 256; i++)
{
r = cmsEvalToneCurveFloat(Vcgt[0], i / 255.0);
g = cmsEvalToneCurveFloat(Vcgt[1], i / 255.0);
b = cmsEvalToneCurveFloat(Vcgt[2], i / 255.0);
fprintf(fileout,"%f %f %f\n", r,g,b);
}
}
Thanx.. again for the hints and for your library too..
Reem
--------------------------------------------------
From: <marti.ma...@littlecms.com>
Sent: Monday, October 11, 2010 2:16 PM
To: "Reem EL asaleh" <reem.elasa...@wmich.edu>
Cc: "Lcms Liste" <lcms-user@lists.sourceforge.net>
Subject: Re: [Lcms-user] reading vcgt tag
> Hi,
> A clean way to dump any kind of VCGT as 3 256-entry tables from 0 to 1
>
>
> Vcgt = cmsReadTag(hProfile, cmsSigVcgtTag);
> if (Vcgt != NULL)
> for (i=0; i < 256; i++)
> {
> cmsFloat32Number r = cmsEvalToneCurveFloat(Vcgt[0], i / 255-0);
> cmsFloat32Number g = cmsEvalToneCurveFloat(Vcgt[1], i / 255.0);
> cmsFloat32Number b = cmsEvalToneCurveFloat(Vcgt[2], i / 255.0);
>
> printf("%f %f %f\n", r,g,b);
> }
>
> Regards
> Marti
>
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