any chance you could Flatten a copy of the file and then take your colors from that?
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@Loic – nothing much to offer here from my side. Just a source by Adobe which is very likely outdated, but you can look for hints doing research on the theme:
"Transparency in PDF, Adobe Developer Technologies, Technical Note #5407" from 30 May 2000 at:
3 Color Compositing Computations
4 Shape and Opacity Computations
6 Soft Masks
7 Color Space and Color Rendering Issues
should get you going. At least a bit. See for yourself…
I thought about flattening but it would mean having a PDF right ? I hgope I could stay within InDesign.
Thanks a lot for the link. I will have a look at it
Best to both of you