• Custom lets you adjust the black generation curve manually. Before choosing Custom, first choose an option (Light, Medium, Heavy, or Maximum) that is closest to the type of black generation you want. This gives you a black generation curve to use as a starting point. Then choose Custom, position the pointer on the curve, and drag to adjust the black curve. The curves for cyan, magenta, and yellow are adjusted automatically relative to the new black curve and the total ink densities.
Black generation examples:
A. No black generation (Composite image, CMY, K) B. Medium black generation (Composite image, CMY, K) C. Maximum black generation (Composite image, CMY, K)
3 If needed, specify values for Black Ink Limit and Total Ink Limit (the maximum ink density your press can support). Check with your print shop to see if you should adjust these values.
In the Gray Ramp graph, these limits determine the cutoff points for the CMYK curves.
4 If you selected GCR as the separation type, specify an amount for undercolor addition (UCA) to increase the amount of CMY added to shadow areas. Check with your print shop for the preferred value. If you are unsure of this value, leave it at 0%.
UCA compensates for the loss of ink density in neutral shadow areas. This additional ink produces rich, dark shadows in areas that might appear flat if printed with only black ink. UCA can also prevent posterization in subtle detail in the shadows.
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