![]() So they tend not to work on the buggy images. įor whatever reason, MacOS Quartz filters only work if they will reduce image sizes. I have experimented with options to compress images in Ghostscript, with mixed success, and with the above bugs persisting. But it doesn't tackle some oversized or poorly-constructed images, it often creates dark rectangles which can obscure text, and it occasionally loses the ability to search or select text. It converts jpeg2000 images to jpeg images. I can also use Ghostscript with -dCompatibilityLevel=1.4, which doesn't rasterize everything. It's something of a last resort for pdf-born-pdfs, since text can be uglier and harder to read, and file sizes can increase alarmingly. If more detail is needed, -mode copy without -dev dx will preserve higher resolution. I can use Willus's k2pdfopt with -mode copy and -dev dx, which rasterizes everything. ![]() I cannot use touchscreens, so newer e-readers and tablets aren't a solution. It also has trouble with too many or too large jpeg images. I am using MacOS Mojave on a Mac Mini, and I am also using an old Kindle Dx which cannot read jpeg2000 images.
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