9/30/2010 5:39 AM keltezéssel, bobdobbs írta:
> 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?
> Thanks.

You have to add alpha channel from the image menubar through Layer → 
Transparency → Add alpha Channel.

With an alpha channel, the default operation of eraser is deleting to 
However, if you want to turn white to transparency, you'd better use 
Colors → Color to alpha.

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