Rendering intent, where?

Jossie · January 19, 2016, 6:35pm

Where do I specify the rendering intent in RT? I have searched through “Preferences” and the “Colour management” tab but did not find it.

Hermann-Josef

Morgan_Hardwood · January 19, 2016, 6:44pm

If you’re using the latest development version, you can change the preview’s (monitor’s) rendering intent in the Editor tab under the preview. Otherwise its hard-coded.

Jossie · January 19, 2016, 6:50pm

Thanks for the info.

I came across this contribution. So things seem to have changed?
Hardcoded? Which intent is hardcoded: perceptual, saturation, relative or absolute?

Hermann-Josef

Morgan_Hardwood · January 19, 2016, 8:10pm

Looks like relative colorimetric.

github.com

Beep6581/RawTherapee/blob/91f67f0cb6760cc2703cfaeb698bd4fa12ee6064/rtengine/improcfun.cc#L226

    
      
                  monitorProfile = iccStore->defaultMonitorProfile;
              }
          
          
#endif
          
          
    cmsHPROFILE monitor = iccStore->getProfile ("file:" + monitorProfile);
          
          
    if (monitor) {
                  lcmsMutex->lock ();
                  cmsHPROFILE iprof  = cmsCreateLab4Profile(NULL);
                  monitorTransform = cmsCreateTransform (iprof, TYPE_Lab_FLT, monitor, TYPE_RGB_8, INTENT_RELATIVE_COLORIMETRIC,
                                                         cmsFLAGS_NOOPTIMIZE | cmsFLAGS_NOCACHE );  // NOCACHE is for thread safety, NOOPTIMIZE for precision
          
          
        Glib::ustring outputProfile;
          
          
        if (params->icm.output != "" && params->icm.output != ColorManagementParams::NoICMString) {
                      outputProfile = params->icm.output;
                      cmsHPROFILE jprof = iccStore->getProfile(outputProfile);
          
          
            if (jprof) {
                          lab2outputTransform = cmsCreateTransform (iprof, TYPE_Lab_FLT, jprof, TYPE_RGB_FLT, INTENT_RELATIVE_COLORIMETRIC, cmsFLAGS_NOOPTIMIZE | cmsFLAGS_NOCACHE );

Jossie · January 20, 2016, 10:28am

Thanks for the information.
According to what I read, relative colorimetric is the optimum choice for images. Nevertheless, are there any plans to let the user decide which intent to use?

Hermann-Josef

Morgan_Hardwood · January 20, 2016, 12:36pm

Yeah, we’re working on it.