pts
Adobe Acrobat Pro 11.0.20.17 displays the image incorrectly
pdfsizeopt on windows completely distorts the image in the sample pdf. It happens at least with the following commands:
--use-image-optimizer=ECT,jbig2 --use-image-optimizer=pngout,jbig2 no commands
sample.pdf sample optimized.pdf
EDIT: after opening the files in my browser, I realize this happens with Adobe Acrobat Pro 11.0.20.17 but not with Chrome or Firefox. Acrobat being a more complete program developed by the inventors of the pdf format, I think this is still a valid issue. Here's what it looks like:
The optimized PDF file works for me in Chrome, Firefox, Evince and Ghostscript.
It looks like Adobe Acrobat has a bug rendering the /SMask image. Maybe the bug is related to /Filter/JBIG2Decode.
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Does
pdfsizeopt --use-jbig2=nofix it for Adobe Acrobat? -
Have you tried reporting the bug to Adobe?
The output is still distorted.
I have not reported it to Adobe. It may also have been fixed in a later version of Adobe Acrobat Pro, 11.0.20.17 is quite old. I don't have access to a newer version.
Adobe Acrobat Pro 11.0.20.17:
Thank you, this is exactly how it looks for me in other viewers (e.g. Chrome).
It looks like that Adobe Acrobat Pro 11.0.20.17 has problems rendering the /SMask image, even if it's not JBig2-encoded.
Could you please upload the output PDF with pdfsizeopt --use-jbig2=no and a screenshot of Adobe Acrobat Pro 11.0.20.17 displaying it?
With the 2017 binary of pdfsizeopt, it looks exaclty like the screenshot in the first post.
With the latest binary (v7), I get an error and no image is displayed:
Could you please upload the output PDFs you got in https://github.com/pts/pdfsizeopt/issues/131#issuecomment-1445206889 ? It's very interesting that that the output of two versions of pdfsizeopt behave differently in Adobe Acrobat Pro.
I have a suspicion on what can cause the problem. I'll give it a try after I get the PDFs. (My suspicion is that for Adobe Acrobat Pro to work, the /BitsPerComponent of the /SMask image must be either 8, or the same as /BitsPerComponent of the source image.)