Hello GIMP developers:

I am working on a project where I need to set all pixels below a level as alpha 
channel, is there a quick way to achieve this? The level can be both set a 
priori or adjusted dinamically, the second way is prefered. Right now my 
workflow includes:
1. duplicate layer.
2. use color level in duplicate layer, in menu COLOR -> LEVEL.
3. add alpha mask to original layer
4. copy duplicate layer into the alpha mask of the original.
5. delete duplicate layer.
6. If result is not ok then return to 1.
As you can see this workflow is a headache, specially point 6 which is often 
Any thoughts

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