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I decomposed a rgb image. It has 3 layers of r, g, and b now. I think using recompose is faster than composing since recomposing doesn't bring up the dialog. But, when I did colors>components>recompose, nothing happens. What should I do for making something happen?

Quote: But, when I did colors>components>recompose, nothing happens. What should I do for making something happen?

You need to adjust, at least, one of the layers.

Start off with this: https://i.imgur.com/Le8Nh2V.jpg
Make some adjustment. Curve applied to blue layer - (remember to re-enable the layer visibilities): https://i.imgur.com/6qb0zZ5.jpg
Recompose gives this: https://i.imgur.com/z6XDyAN.jpg