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Affinity Designer 2.1 and 2.2.0 2005 beta (help says: 2.2 eb0ee), on iPad Pro 12.9 sixth generation, iPadOS 16.6.1. A transparent png with a filter on a background with reduced opacity (e.g. 50 %) will darken the background within the bounding box of the png when exported to pdf. See the two screen shots below (cropped). The rightmost one is from the pdf and has a darker area in the transparent part of the png: The enclosed zip file has 7 files with reduced complexity with only one page with two objects (extracted from a 144 page book with several of those glitches in seemingly random places). The files with suffix beta are pdf's generated by the beta version. The other pdf files are generated with AP 2.1. The three original files: 1. filter-opacity-pdf-glitch.afpub: Reduced original that exhibits the export glitch. It has a png with an adjustment filter on top of a blue background with partial opacity. 2. opacity-pdf-glitch.afpub: Without the png adjustment filter. Produces no glitch. 3. filter-pdf-glitch.afpub: With full opacity of the background. Produces no glitch. As for other pdf generation errors, there are workarounds (e.g. produce the colour levels without opacity reduction), but they are quite cumbersome and troublesome to first detect, and next figure out. Best regards, Hans PS: The example glitch is pretty light. One may obtain much darker contrast glitches. pdf-png-glitch.zip