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Question: Quartz filters can't filter certain pdfs...

I have an automator set up to convert pdfs to grayscale. It can convert some pdfs, but it converts some pages, and not others, of other pdfs. It doesn't seem to depend on image format: some non-jpeg-2000 images resist conversion, some jpeg-2000 images get converted into other formats.


Any idea what is going on?

MacBook Air (11-inch Mid 2013), macOS Sierra (10.12.6)

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Nov 17, 2017 10:48 PM in response to Marja E In response to Marja E

It fails with *almost all* pdfs. It always fails with any created or proccessed using MuPDF. It occasionally succeeds with some created in Adobe InDesign or PageMaker. It occasionally succeeds with older versions of Quartz.

Nov 17, 2017 10:48 PM

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Nov 18, 2017 7:30 PM in response to Marja E In response to Marja E

I tried the same setup on 10.6.8. It managed a good clean conversion of some of the same files. Based on my own earlier complaints, the bug may originate in the 10.12.3 update, in January of this year. I don't really know what to do about it. I might be able to convert a usb hard drive into a bootable 10.12.2 drive... Any other ideas?

Nov 18, 2017 7:30 PM

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Nov 18, 2017 7:38 PM in response to Marja E In response to Marja E

Or it could date to the rewrite of PdfKit for 10.12, in which case it would be better to go for 10.11.6.

Nov 18, 2017 7:38 PM

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Nov 19, 2017 6:10 PM in response to Eric Root In response to Eric Root

Yes. Right now, I'm using automator on an older computer. Most of the tools I've tried are different front-ends and filters for Quartz, so they succeed or fail together. k2pdfopt and PdfGenius are the exceptions. k2 can use MuPDF or GhostScript. It'll work on any PDF, but tends to yield larger and lower-quality images than Quartz. PdfGenius can use Quartz or its own Image filters.

Nov 19, 2017 6:10 PM

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Question: Quartz filters can't filter certain pdfs...