Hehe, yeah I thought of that too. I rejected it because I thought it will be expensive, might be wrong though.
For each input image you will have to copy the channels you want in a new image. Imagine doing that for 2 or 3 input images for each operation. Imagine now an image sequence and for each frame lots of operations. I dunno, maybe it is not that expensive? The solution I got now seems much less expensive.
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