Shades of a global color

It's easy to create tints of a global color, and I really like how if the global color is changed, the tints are as well. But why can't you do the same for shades? It would be great timesaver for shading & highlights on artwork that might change color.

Tints simply reduce the percentages of the color's existing component primaries, for both spot and process colors. Assuming subtractive color (CMYK document), creating shades of spot colors--and of process colors not containing K--would require addition of K (or the complementary primary, etc.) In the case of spot colors, the result wouldn't be a spot color any more. In the case of process colors, you would encounter ambiguities similar to those affecting black generation in RGB-to-CMYK conversion: just as there are myriad ways to generate K, there would also be many ways to darken a color.
In other words, creating tints is a simple and unambiguous matter of decreasing existing percentages. Creating shades would not be a simple matter of increasing percentages, and would have to deal with color-specific ambiguities.
JET

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