Hi all.

I'd like to delete in such a way that transparency remains.

I've found that this is the default when I'm working on images that I've 
created myself.
But if I'm working on an image that I've downloaded or gotten from another 
source, I can't predict the behaviour of functions that remove pixels.

In my immediate case, I've got a icon with a white background. I want to remove 
the background. 
However, when I try to remove the white pixels, the result is black pixels.

How can I figure out what the result of deletion operations on pixels will be?

How can I consistantly remove colour, leaving transparency?


bobdobbs (via gimpusers.com)
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