I have been trying out ICC Profiles based on Different paper types and Different levels of GCR.
Great premiere post, ddonevski. I'd say that sums it up very well. Welcome to the forum!...The thing is, we only need three variables (CIE L*a*b* or XYZ) to specify the color, but we have four inks at our disposal. The presence of K, in addition to the ability to render dark colors not obtainable by CMY alone, also provides the ability to replace some of the CMY combinations (gray component present in them) with K....
How does this contradict my statement? We agree that they (UCR and GCR) differ in how far from absolute neutrals they introduce Black. UCR operates in near neutrals and is therefore a subset of GCR. GCR takes it (in addition to near-neutrals) a little further and applies black farther from near-neutrals, or as You stated, "It applies wherever the 3 chromatic (CMY) colors print together.".
I can't see any disagreement between our statements.
I'm afraid you are misinformed. A UCR separation is much, much less stable on press than a GCR separation.
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