I have a PDF and I want to verify the colours being used (check that they match our corporate colour scheme for instance). Specifically, I want to check that the correct CMYK colours are being used.
How could I go about doing that?
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The GIMP can easily tell you the RGB or CMYK values of any color in a pdf. When you open the pdf, it will offer to treat each page as a layer. That's fine, you just need to select each layer as you look at it and make each layer above it invisible.
Then use the color picker tool (eyedropper icon) to click on any color in the pdf. It will automatically select it for the foreground, but you can check the option to " use info window" to see RGB, CMYK, HSV, etc on whatever you select.