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Please download the PDF and see the screenshot beneath. I'm trying to convert the book's default (C, M, Y, K) = (99%, 98%, 18%, 6%) (ie dark purple) to (90, 0, 90, 0) (green). After I click 'OK' and click 'Fix', Adobe Acrobat executes the fixup, but the color fails to change.
Not sure what went wrong at your end. I have used the exact same settings as you (see attached screenshot) and it worked as expected. What version of Acrobat are you using?
