With the alpha channel we gain control over the opacity information of an object, so we can make it transparent. We can also paint in the the alpha channel to ‘form’ a selection to our liking. We use the alpha channel in the same way as in the icecube video but this time we delete the black background of a flame image.
http://www.screenfrog.com/photoshop/a-warm-place-more-fire/#more-44
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