[Gimp-user] How to remove alpha channel?

[Joerg Bergmann]

For some Latex application, I have to crop some image. I load
a tiff into GIMP. It will be one gray channel only. I copy some part
of the image and include it as a new image. This new image has,
unfortunately for me, been added an alpha channel. There seem
to be no way to remove the alpha channel or, as an alternative,
to store a tiff without alpha channel. Simply spoken: I do not
want alpha channels in my tiffs.

Thanks for a hint.

Joerg Bergmann