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Here's an issue that I've never experienced or noticed until recently in photoshop-
I am removing some background fills from raster images and want to export as photoshop .PDF files, however when I go to 'save as' I am seeing that the newly transparent images are being flattened to white once more.
I've tried the default export options for high quality prints, pdf-x4 as I have seen suggested elsewhere... I am not sure why the alpha information is not being retained when exporting this way. Is this a bug or am I (hopefully) missing something?
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Are you saving to jpeg? Or is jpeg compression enabled in PDF Export options?
The jpeg specification doesn't allow transparency.
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Sadly, selecting compression of 'none' or 'zip' still yields an exported photoshop .PDF without transparency for me.
Maybe I am misremembering that photoshop .PDF files have the ability to export with transparency. Seems I'll have to stick with .PSD or .TIF files for CMYK transparent images from photoshop, I appreciate your insight.
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As you mentioned, if you want PDF select PDF/X-4.