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It appears we can save quite a bit of filesize (another 50% decrease for the default) by leveraging the algorithmic noise in JPEG-XL rather than baking grain into the files to fight color banding.
@jimmac it also looks like we'll get 10bit colors by default (on most common hardware) into #gnome45 which should help aswell I suppose?
See https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3139
GitLabbackends/native: Try 10 bpc formats (!3139) · Merge requests · GNOME / mutter · GitLabIf the EGL platform and all KMS CRTCs support them. 10 bpc formats may allow for more accurate colour reproduction / less colour banding, subject to...
@jimmac By the way, I wonder if you want to update the compression settings for that? Our current ones are probably optimized for 8bit.
@rmader I'll investigate the filesize cost of that. Majority of the wallpapers are renders and higher bit depth is easily attainable.