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openfnord/pdf to pdf: reduce version

Created April 28, 2022 03:06
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pdf to pdf: reduce version
Reduce pdf version in order to use old Acrobat7 for OCR and Image-Size-Reduction
(Acrobat 7.0: Menue: "File, reduce-file-size" -> compatibility with 4.0).
Acrobat 7.0 was given away for free by adobe, and you may find it in some archives of the internet
You can use Acrobat 7.0 perfectly with wine in linux.
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dNOPAUSE -dBATCH -sOutputFile=out.odf old.pdf
Also you can use this to fight some issues with crashing pdf tools.
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