Feature request: dimming option for Reader

edited 2 days ago
I'd like to have the ability to dim the Reader. This helps avoid nearly all the issues related to image and text colors being inverted or being conflicted with the themes. It'd also works on PDF made from scanned image (so would help with cases like this. It's the same as turn down the screen brightness, but if I reduce my screen brightness, other UI elements in dark mode become too hard to see.

Currently I'm using the Ethereal Style plugin to help with reading PDFs, and my CSS code for its PDF Styles is just canvas{filter: brightness(0.6) !important; } and I'm very happy with the result, for example:
https://s3.amazonaws.com/zotero.org/images/forums/u8904213/pv97lf6w6o3e5k3rxnla.png
Using the new theme support, I've tried to replicate a similar look by setting Background to #999999 and Foreground to #000000, but some page elements aren't darkened (I guess those are images) and stick out, which degrades the reading experience.
https://s3.amazonaws.com/zotero.org/images/forums/u8904213/qf8372xkooq0lh8vwwhx.png

In other cases it's hard to read the text:
https://s3.amazonaws.com/zotero.org/images/forums/u8904213/w82gnnt8empqtmazj0pk.png
https://s3.amazonaws.com/zotero.org/images/forums/u8904213/3mhhceu12g9dva4h66l8.png

In this case it makes the graph more confusing:
https://s3.amazonaws.com/zotero.org/images/forums/u8904213/gc44fzvhf8bae3mehp1m.png

The Ethereal plugin doesn't have any of these issues because it reduces the brightness for all elements. However, it doesn't work with EPUB and webpage snapshots. Now that Zotero is considering support theming more thoroughly, my feature request is to have the ability to dim the Reader globally, across all 3 types of attachments. The reading experience would be much more consistent.

Thank you!
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