how to merge jupiter pics with it's moons
The idea in GIMP is, after processing everything in Registax - make a new pic first, totally black (helps), then open as layer your jupiter picture (this u can derotate and flip according to your gusto, I do a bit of brightness/contrast/sharpness back and forth), then open as layer your moon picture (that one will need sharpening, contrasting etc.). Now you have a big bright blotch in that picture, right? Don't worry about it - take a note of it's position [unsure how to align to pics] because u will need to move the proper jupiter pic in the right position. Now open the layer dialogue window (I couldn't find it for ages - it's under windows/dockable dialogues/layers).
Right click on the moon layer and click on "add layer mask" - a little box opens - choose "black full transparency". Now you see the jupiter picture, choose "brush" from the tools menu (make sure that the layer mask is high lighted - the little black box behind the moon thumb in the layer dialogue window) and start "painting on this jupiter picture in the area, where the moons are supposed to be - and voila, they magically appear.
Then you need to apply the layer mask (right click on it) and flatten the image and save.
Finished.
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