GIMP: TIFF save cannot handle indexed images with alpha channel

When I wanted to save TIFF file, I got this message box:

TIFF save cannot handle indexed images with alpha channel

Although I had no alpha layer.

Here is an example which cannot be exported to TIFF file because of a not-existing alpha channel

It seems to be a bug - I do not know - the only remedy is:

Ebene/Ebene auf Bildgröße and export as TIFF afterwards.

2 Answers

If this doesn't work:

menu ⇒ image ⇒ fit canvas to layers 

then try:

menu ⇒ image ⇒ flatten image

Go to layers --> Transparency --> remove alfa channel then export your image.