| Because RGB color monitors do not accurately represent ink on paper, whether CMYK tints or spot colors, you must reference a printed tint guide before entering values in a color palette. This difference is due to the different methods of producing color (additive on monitors versus reflective in printing) and the differences in the range of color gamuts between the two, as well as differences between actual software applications and general limitations of CMYK printing.
Always verify that placed images have been converted from RGB to Greyscale, CMYK or PMS Spot Color before placing them in your page layout application.
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| Many designs require a four-color or "rich" black for best density. This color should not be defined as 100% each of Cyan, Magenta, Yellow and Black since printing presses cannot deal with this much ink coverage and paper cannot hold this much ink. Your-color black values may need to differ based on the nature of your printing project. Remember that the maximum overall ink coverage for sheetfed offset applications is 300%.
For example, some service providers define warm black as the process color of 0% Cyan, 40% Magenta, 0% Yellow, 100% Black. Likewise, cool black is sometimes defined as 40% Cyan, 0% Magenta, 0% Yellow, 100% Black. If a fuller four-color black is requested, recommend a full "rich" black process build as:
60% Cyan, 40% Magenta, 20% Yellow, 100% Black
As always, if you're not sure, contact us about your particular design requirements and expectations. In many cases, such as when photos are placed within a large rich black background, it is appropriate to run an otherwise 4-color job as a 5-color with a second black ink printer in order to control the black dot gain in the photos.
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