Using: 2.9.11 on macOS 10.12.4.
I have some PDFs consisting of scanned pages.
When displayed in DevonThinkPro the image is muddy and unclear.
If the same PDF is displayed in a PDF program, the image is much clearer and crisper:
See the attached screenshot showing DevonThink Pro and PDF Pen Pro next to each other showing the same page.
I do not believe this muddy display was present in an earlier version of DevonThinkPro.
What is “a PDF program” ?
For example, PDF Pen Pro, PDF Expert, and because these two apps are feature limited compared to what is available in several PDF programs running under Windows, I run under vmWare: PDF-XChange Editor.
Anyway, the problem I mentioned became increasingly severe, and started to affect all PDFs opened in DevonThink Pro. The only way to ‘solve’ this was exit DevonThink Pro and launch it again.