Removes the plate with graduated transparency. Partly coloured pixels become partly transparent, so soft edges and stray hair survive. Drag files in from Explorer, or use the picker.
Custom colour keys anything, not just the four presets. Hit Pick colour from image, then click the background in the preview. Click a few different spots if the background is uneven and take whichever result looks best.
Threshold is where transparency starts. In custom mode, higher means fussier, so it only kills pixels very close to your picked colour. Lower it if plate is surviving, raise it if artwork is disappearing.
Falloff is how gradual the fade is. Wider is softer, good for wispy hair. Narrow is crisper.
Despill pulls leftover plate tint out of pixels that stayed. This is the one that kills colour contamination on light clothing and hair.
Edge tighten nudges semi transparent pixels toward fully clear. Use a little if you see a faint halo.
Dial settings in on one sprite, then hit Download all as ZIP. The ZIP is built in memory, so a hundred huge PNGs at once may be a bit greedy with RAM.