On 25/08/14 15:43, wizzythegrape wrote:
I have a picture I'm editing with gimp. I've made a selection of part of this
picture that I'm trying to paint. When I do this, it effects pixels outside of
the boundaries of my selection. This is the first time I've seen this. Does
anyone know how to prevent/solve this?


* http://www.gimpusers.com/system/attachments/147/original/example.png

The marching ants are not the limit of the selection, they are where the selection has a 50% value, so pixels outside the area marked by the ants can be partially selected. Each time you paint over them they are painted slightly. This isn't noticeable on the first strokes but become more visible after several strokes.

For what you want to do, protecting pixels with a selection isn't an efficient technique (problems such a the one above, halos, jagged edges...). You should be using Color-to-alpha (or paint in Color Erase mode) to remove the old color, and apply the new color in "Behind" mode.

Some more explanations here: http://gimpforums.com/thread-proper-subject-extraction-background-removal-and-background-painting<http://gimpforums.com/thread-proper-subject-extraction-background-removal-and-background-painting>
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