Quoting Joerg Bergmann <em...@jbergmann.de>:

> 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.

Use the menu command "Image->Flatten" to remove the alpha channel  
before saving.

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