Glenn Wilton wrote: > The question is where in the transformation process is this tiny error > happening? What I would like to know is a way to tell if its A) the > white point in my profile, B) Its in the LUT or C) the input/output > curves for the LUT.
Typically this is because the white point isn't quite correct. An accurate colorimetric table will have the white point tag close enough to the device white that the B2A returns zero CMYK. You should check whether the A2B CMYK = 0 produces the white point first. If it doesn't, the white point tags probably wrong. If it does, then possibly it's just the B2A not matching the A2B with regard to the white point. This could be due to poor accuracy of the B2A, or a poor choice of grid locations (you have to arrange the per channel tables such that the PCS white lands on an a & b grid line to get an accurate white out of the B2A). Graeme Gill. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
