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Overprinting Options

Multiply? Overprint? Darken? What’s the difference? And how do you choose the method that will give you the results you want in your print job?


This article appeared in Issue 83 of InDesign Magazine.

As a prepress operator, I regularly inspect artwork supplied by clients to make sure that it’s fit to print. And I often notice that they’ve used the Multiply blending feature to make an object overprint its background, when simply applying an overprint from the Attributes panel would have done the job.

By itself, this is not a big issue, but it’s important for InDesign users to understand that the Multiply feature is not the same as the overprint attribute. The purpose of the overprint attribute is to enable an object assigned with a specific color to overprint (that is, print on top of the objects behind it without “knocking out” the colors underneath it). Multiply, on the other hand, is a blend mode that uses a mathematical formula to determine the color of an object’s contents based on the colors underneath the object.

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Colin Flashman

Colin Flashman

A prepress operator and graphic designer for a South Australian commercial printer, with close to 20 years of experience in the trade. He is also a regular contributor to this site and InDesign Magazine, and hosts his own prepress blog "Colecandoo".
Colin Flashman

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Comments

2 Comments on “Overprinting Options

  1. I am running a fifth colour (K100%) over a full colour image. My type is set to overprint as I do not want to pierce the colour. When I check ink limits the type shows red indicating the limit is exceeded. The full colour image is not exceeding the ink limit, just the overprinting type. Why is this happening? How can I fix this?
    Thanks Colin.

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