in the analog printing industry it is usual to use for black backgrounds 100%black or 100%black with 20-40%cyan. the standard black from adobe hast a definition of all cmyk colors which causes a brown-red-black, when printing with them. so now if you have a black area with the usual black (30c0m0y100k or 0c0m0y100k) and have a form on that area, for example a red circle (color definition for the circle is not important) with a feather of 30 you expect to have a gradient from this circle color to the black. but what photoshop does (and illustrator, too) is to put a white (no color) shine under the gradient. this happens only in cmyk mode, not in rgb mode. and this is not comprehensible at all.
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