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PNG Files with transparency inside a CMYK creates different colored backgrounds on export for some PDF/X formats

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Hi Affinity Team,

I am having some issues with PNGs with transparency. If I add these PNGs inside a CMYK document and export them as PDF I get different colors behind the transparency of the PNG. This happens when I use the format PDF/X-1a:2003 or PDF/X-3:2003. If I use the PDF/X-4 the transparency problem does NOT occur. It would be great to fix this issue since most professional printer would like to have files with the PDF/X-3:2003 format.

 

Thanks and Kind Regards

Tim

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I am also having this issue with BlendModes.

If I add a graphic with a white background and I use blend mode Multiply, I am having the same issue on export to PDF/X-1a:2003 or PDF/X-3:2003

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