Am 12.07.2013 22:43, schrieb Mikael Ståldal:
Is there an easy way in GIMP to invert the alpha channel of an image?
Transparent should be opaque, opaque should be transparent, almost
transparent should be almost opaque, etc.
Yes, there is:
1. Choose "Colors -> Components -> Decompose" from the menu and set
"Color model" to "RGBA".
2. A new image is opened with all color channels (including alpha
channel) decomposed as single layers.
3. Select the layer "alpha" and choose "Colors -> Invert" from the menu.
4. Choose "Colors -> Components -> Compose" from the menu, set "Color
model" to "RGBA" and make sure the layers are correctly mapped to
the channels (should be given if you did not reorder the layers)
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