Printing indd to composite grey PDF: 100% black turns 92%

Question

I want to print (or export) a coloured indd to a grayscale PDF (InDesign 2022). In the print/output window I set the output color to Composite Grey. The black objets and text must be remain 100% black. But in the produced PDF all black objets become K 92% - why? I have already tried all settings, switches and pipes...

This problem appeared some weeks ago, and the two other PC near mine do it well. Some idea?

rob day · Accepted Answer

If you are Exporting to a Gray Destination Profile, set your Appearance of Black Exporting Preference to Output All Blacks as Rich Black

Peter Spier · Answer

Reset the Appearance of Black settings in your prefs to Output All Blacks as Rich Black:

Because rich blacks are darker than 100%K grayscale devices reserve solid black output for rich blacks. Changing the prefs solves that and has no effect on color output.

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