PDF appears very dark when viewed in DocView on MacOS

When I view PDFs in Emacs using DocView, they appear much darker than they should: ​ [Emacs and Preview displaying the same PDF, where it is much darker in Emacs](https://preview.redd.it/3ej89u28d9i81.png?width=2880&format=png&auto=webp&s=57ee4ab626962e5508ac169887a1933a1e99cf6f) I am not sure why this happens -- I haven't changed any settings related to DocView or enabled any minor modes that would cause this. Disabling my current emacs config (by moving .emacs.d) does not resolve this. I am using the mituharu emacs-mac port from [this](https://github.com/railwaycat/homebrew-emacsmacport) Homebrew formula, but the issue also exists with the build from [https://emacsformacosx.com](https://emacsformacosx.com). My .emacs.d is on GitHub [here](https://github.com/AjayMT/.emacs.d). Has anyone encountered a similar issue before? How would I go about resolving this? UPDATE: I found out that the issue is caused by GhostScript, as expressed in [this](https://old.reddit.com/r/emacs/comments/su610o/pdf_appears_very_dark_when_viewed_in_docview_on/hx8tike/) comment. I've resolved it by installing mupdf (`brew install mupdf`), which should cause docview to use `mudraw` to convert PDFs to temporary PNGs instead of GhostScript. After installing mupdf, opening a PDF in DocView and running `doc-view-clear-cache` should resolve the issue.

Just checking: is `pdf-view-midnight-minor-mode` enabled?

This suddenly happened to my DocView today too... glad I'm not crazy! I have no clue what caused it, but it seems like much of the white background in my pdfs is now rendered as grey.

Thinking about it again now, this makes me think it's somehow a consequence of Homebrew auto updating something — maybe something like `dvipdf` has had an update recently?

Nope, I am using DocView and not pdf-tools

I suspect this is the case as well — I’ll look into which packages I’ve upgraded

There seems to have been an ImageMagick version that came out today: - https://github.com/Homebrew/homebrew-core/commit/03abe957c52d75f774d7b30be54782367f7cfd0c - https://github.com/Homebrew/homebrew-core/commit/a3fc895805a3191ef8c0a828b33c863842d66b6e I can't test rolling back my ImageMagick version right now, but I'll see if it does anything later today

Try rolling back your ImageMagick version!

https://emacs.stackexchange.com/q/70573/105

Oh, my mistake; I misread the question.

Yep that’s me 😅

Tried rolling back by installing [imagemagick@6](https://github.com/Homebrew/homebrew-core/blob/master/Formula/imagemagick@6.rb) but that didn't help :(

Ok I've figured out that the issue is caused by GhostScript. This is the command that DocView runs to convert each PDF page to a png: gs -dSAFER -dNOPAUSE -sDEVICE=png16m -dTextAlphaBits=4 -dBATCH -dGraphicsAlphaBits=4 -dQUIET -r100 -sOutputFile=out.png in.pdf You can try this and check if it outputs a grey PNG like the one you see in emacs -- that's what I'm seeing