Re: [Lcms-user] reading and writing AToBx tags

[Reem EL a. <ree...@wm...>]

Hello,

I just want to let you know that I have fixed my problem, and thanks to 
Marti the solution was in one of his src code files.
Anyway the following code will read the contents of the input or output 
table and extract the data to text file:

static void EvaluateCurves(const cmsFloat32Number In[], cmsFloat32Number 
Out[],  const cmsStage *mpe)
{
    _cmsStageToneCurvesData* Data = (_cmsStageToneCurvesData*) mpe ->Data;
    cmsUInt32Number i;

    if (Data ->TheCurves == NULL) return;

    for (i=0; i < Data ->nCurves; i++) {
        Out[i] = cmsEvalToneCurveFloat(Data ->TheCurves[i], In[i]);
    }
}

//-------------------------------------------------------------------
int main (void)
{

char    out_f[]="C:\\TXTfile.txt";
FILE    *fileout;
cmsFloat32Number  In[4], Out[4];

fileout = fopen(out_f, "w+");

cmsHPROFILE hProfile = cmsOpenProfileFromFile("C:\\ICCPofile.icc", "r");
cmsPipeline* A2B0 = (cmsPipeline*)cmsReadTag(hProfile, cmsSigAToB0Tag);

cmsPipeline* prelin = cmsPipelineDup(A2B0);
cmsPipelineUnlinkStage(prelin, cmsAT_END, NULL);    // remove postlin
cmsPipelineUnlinkStage(prelin, cmsAT_END, NULL);    // remove lut
cmsStage*  prelinStage = cmsPipelineGetPtrToFirstStage(prelin);

for (int i=0; i < 256; i++)
{
In[0] = In[1] = In[2] =In [3]= i/255.0;

  EvaluateCurves(In,Out,postlinStage);
  fprintf(fileout,"%f %f %f %f\n", Out[0], Out[1], Out[2], Out[3]);
}

cmsCloseProfile(hProfile);
fclose(fileout);
return 0;
}


-----Original Message----- 
From: Reem EL asaleh
Sent: Sunday, October 31, 2010 10:42 PM
To: lcm...@li...
Subject: [Lcms-user] reading and writing AToBx tags

Hello there,

Based on my reading on the Pipeline structure, I understand that you can
check the number of stages by using cmsPipelineStageCount, and thus you can
have an idea of what combinations are stored in A2B tag. And by using
cmsStageType you can know what are the stages types (i.e Matrix, curve or
CLUT).

I want to focuse on the simple A2B combination that contains only a matrix,
clut and 1D curve. And thus, I want to dump the contents of each in a txt
file. I tried to use the cmsPipelineCheckAndRetreiveStages (A2B0,1,
cmsSigCurveSetElemType, &cv ) but I retrieve a null pointer.

Its really important to me to do this stage and I want to use lcms2 because
I found a lot of other functions that are very useful to me.

I would really appreciate it if someone could help me with this

Reem


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