With further (very limited) investigation after you bumped this topic thread, I will no longer use Convert Colours for general use and will use a Preflight Fixup/Profile. Convert Colours does not have an option for BPC whereas preflight fixups/profiles do. Using Convert Colours I am not getting the same appearance as I do in Photoshop with the same settings, whereas the Preflight Fixup does have the same visual appearance and does include an option for BPC. I am not talking about plugged shadows, which is expected when converting from RGB to CMYK with no BPC when the RGB has darker blacks. Further, deeper investigation is needed, both for the JPEG recompression issue and general colour issues. This will take a serious amount of time/effort to fully investigate.
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