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Vandalay110

: How is Illustrator overprint preview calculated? I'm trying to plan an art print, and I need to use overprinting to reach the colors I'm after. For the most part, Illustrator's multiply blend

@Vandalay110

Posted in: #AdobeIllustrator #Overprint #PrintDesign #PrintProduction

I'm trying to plan an art print, and I need to use overprinting to reach the colors I'm after. For the most part, Illustrator's multiply blend mode seems to function the same as the overprint preview. But not always. Different colors all seem to work differently.

Can anyone explain why this is happening?



After further studying this, it looks like the literal Cyan and Magenta colors work as expected, but color blends don't. Here's an example of two boxes that are close to cyan and magenta, and two that are actually 100% those colors:



This is related to my other overprint question.

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@Eichhorn212

Overprinting only works on spot colors and (pure) C, M, Y, or K. If you change the color type to spot, you will see the results you expected.

Caveat: using spot swatches in conjunction with transparency effects like multiply or <100% opacity levels may cause unexpected output results. The overprinting attribute doesn't cause these issues.

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