Suppose you have a picture without alpha-channel and you want to make one from it. for example , this one is without (the black background is an opaque black color).
You can use this small flash to load a file from your desktop and save it with the background as alpha-channel.
The huristic for finding the background color is simple: check what is the most common color and use it. On some pictures , it won`t work (but on most it will)
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