The image editor gets an Adjust tool: exposure, contrast, saturation and invert, previewed live and saved beside your crop, rotate and mirror edits.
Immich's editor can crop, rotate and mirror. The moment a photo was a little dark, a little flat or a little grey, you had to download it, fix it somewhere else and upload a second copy. In a family library that second copy then lives next to the first one forever.
The editor now opens on an Edit panel beside Crop. Exposure, Contrast and Saturation each run from -100 to +100, and Invert turns a scanned film negative back into a positive. The preview uses the same formulas as the saved result, so what you see while dragging is what you get. Double-click a slider to reset just that value.
Adjustments are stored next to the crop, rotate and mirror edits, not mixed into them, and they are applied after them. Older apps and a stock Immich server never see an edit they cannot read. Reset changes removes them in one go, and switching back to Immich drops the adjustments and keeps the rest.
Adjustments are made in the web app. The phone apps show the adjusted photo, and cropping or rotating it there keeps the adjustment. Space editors who can edit members' photos get the same tool.
Ready to run Gallery on your own server? The install takes about five minutes.