Color to alpha now requires an alpha-channel (used to add one automatically)
GIMP version: 2.10.4
Operating System: Linux
Package: flatpak
Description of the bug
In 2.10, Color>Color to alpha
is disabled if the layer has no alpha channel.
In 2.8, Color>Color to alpha
is enabled even without an alpha channel (unless the image is color-indexed), and the alpha channel is added automatically if needed.
Edited by ofnuts