I can not select the option add alpha channel on gimp, why? What can I do to correct that error?

  • 1
    Maybe you already got an alpha channel? Oct 19, 2017 at 6:55
  • 1
    Is the option Remove Alpha Channel available? If so, then the layer already has an alpha channel.
    – Billy Kerr
    Oct 19, 2017 at 7:18
  • If you're wondering why it seems like you magically get alpha channels sometimes, it looks like GIMP will add an alpha channel automatically when you add a layer (even if that layer doesn't have a background of type Transparency); I suspect that GIMP uses alpha channels for its internal use. E.g., this caught me off guard when editing a single layer grayscale image, then it silently converted my image on save to an RGB with alpha image. Check the channels tab if you are ever in doubt.
    – jrh
    Aug 13, 2018 at 19:56
  • See Also: Why does GIMP add an alpha channel at every opportunity?
    – jrh
    Aug 13, 2018 at 19:57

1 Answer 1


As other say, the layer already has an alpha channel.

Tip: in the Layers list (Ctrl-L), layers without alpha channels have their name in boldface, while those who have use the regular font weight.

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