[Gimp-user] Gimp channel mixer

[programmer_ceds <forums gimpusers com>]

Works for me using 2.9.7 portable used in multi-window mode (commit 1773cd9)
from Partha's site (Windows 7 64-bit)

I just set the red in red to zero and the green in red to 1.0 and vice versa
then pressed OK. I didn't see a thumbnail but the active image changed as
expected whilst editing, if I had the preview selected, and was changed as
expected when I clicked OK.

If this later version gives you the same problem could you list the exact steps
that you are using and I will see if I can reproduce the problem.

If you have the preview option selected does the active image change when you
alter the channel mixer settings?

> I'm trying to use the GIMP channel mixer to reverse the red and green
> channels in a TIF image. I'm using GIMP 2.9.6.
>
> After swapping the channels etc. and hitting OK, all that happens is
> that a very small thumbnail appears in the top left corner of the main
> image. I can see that the channels have been reversed in the
> thumbnail, but the main image remains unaltered.
>
> I cannot find a way to apply the changes to the main image, I'm very
> new to GIMP and image editing software, so I hope the solution isn't
> something any ten year old child could work out! Any help greatly
> appreciated

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programmer_ceds (via www.gimpusers.com/forums)