After reading https://pdfa.org/pdf-differences-one-year-later/ I've been going through the test set at https://github.com/pdf-association/pdf-differences yesterday.

Surprisingly, we pass many; we fail all files from https://github.com/pdf-association/pdf-differences/tree/main/Atomic-Fill%2BStroke because of java itself. We pass the VerticalText test only by installing an extra font; we do the correct spacing for "Type3WordSpacing" but I'm not sure whether the color is correct because Adobe displays it differently. I've created two issues because of that. I did not test the UnknownFilter files because we might "fail" by displaying too much.

As recommended in the article, I've set a watch on that repository.

Tilman



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