We'll likely be adding a separate option to invert images in Zotero 8, at least for some themes.

Are you trying to recreate the previous white-on-black dark mode exactly or just the images?

If the previous white-on-black dark mode is coming back, would it be possible to consider reverting this patch

https://github.com/zotero/reader/commit/e4266506a226f95678480c4aac0ce181d14b7d23

which I believe was an experimental change made in response to this comment

https://forums.zotero.org/discussion/comment/493411/#Comment_493411

After that change was made, light themes no longer had much effect for many of my PDFs:

https://forums.zotero.org/discussion/comment/494340/#Comment_494340

Over the past year I have been using Zotero on my iPad exclusively for reading papers and textbooks specifically because of the previous white-on-black mode with inverted figures. My eyes are sensitive to light and this previous mode on a screen (especially on oled when possible) is the most relief I’ve ever had working with PDFs.

I would be fine with a toggle to invert images, but I would also like to be able to have the v7 mode as a whole.

I tried so many PDF apps without success and was at the point of building a web app to invert all my pdfs and texts (and embedded images) to use them in regular software (which would be a nightmare for file management). I was ecstatic when I realized Zotero did this for me natively since I already had been using it on all my devices but hadn’t realized dark mode had been added in Zotero v7.

@dstillman, any thoughts about my above comment? Should I create a separate thread for the issue where lighter themes aren't having much effect for some PDFs?