I want to remove the tree from the channel selection (see image below)
How would I do that?
I’d paint it out with a quick mask. Use Shift + Q to activate the quick mask mode. Change to the brush tool. Select black as the brush color. Now paint away the red overlay (which represents your selection). When you’re finished, press Shift + Q to exit quick mask mode.
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I think you had questions regarding noise removal from the foreground of the same image. Assuming that you now want to select only the foreground, you use the Lasso tool with `Subtract" option enabled and just form a loop around the mountain and tree.
In general, all selection tools of GIMP have add ,subtract, replace and intersect options. Typically add is the default choice.
Hope this helps.
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@paperdigits Should I click on the layer or on the layer mask before applying that procedure?
EDIT: I suspect that the answer is “on the layer mask”…
The quick mask is a temporary mask, I don’t think you need to have any specific layer or mask selected, since in quick mask mode you’re editing the selection.
@paperdigits Already found it out, thanks. What I did was:
1 - Do the channel selection
2 - Apply the quick mask
3 - Erase the areas I didn’t want to be in the selection
4 - Add a layer mask from selection
That did the work, thanks!
Edit: I even find it useful, in some of the selections I made, to reduce the brush opacity so that I didn’t completely remove that selection. I think this makes sense since I was doing a channel selection, which I think is more pixel oriented than other selection methods, I believe (some kind of gradient selection, if I may say… but I’m not sure if I’m going too far here 
slight_smile:
Thanks for your time.
In this case, I’m using a channel selection and I felt more confortable with paperdigits way, but I certainly will use yours on other ocasions.
Yes, that does make sense, as you can have opacity in masks and selections.
Glad you figured it out!
Ahahahah!
I’d try that but my budget…