: Convert CMYK into K only Using InDesign I created the interior of a 352-page book. It is supposed to be black only. But some of the diagrams in the book have hidden CMYK values. I created

@Turnbaugh909

Ideally, you would alter the images placed in InDesign using their native applications - Photoshop/Illustrator - then replace them (or update the links to them) in the InDesign layout and regenerate the PDFs needed.

Conversion to Grayscale from CMYK can often result in various percentages of black and rarely will result in 100% black if that's the desired percentage. The only way to ensure 100% black is 100% black is to make certain the original artwork is set to use that color and percentage.

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@Heady304

You don't have to do it as an extra step in Acrobat. You can create the PDF in grayscale to begin with by "printing" to the Adobe PDF driver with "Composite Gray" selected in the Output tab of the Print Dialog.

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@Sims5801359

Can do:


Tools -> PDF Standards -> Preflight -> Convert to Grayscale


or


Tools -> Print Production -> Convert Colors -> Conversion Profile -> Pick the one you want

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