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Yeah, I've been assuming that the stripes are 1px or so wide, as that's the type of ccd artifact I've seen before, but I have to agree that mt_convolution could be slow if this stripes are big. However, using offset, and considering its 1 dimensional, it shouldn't get crazy, I seem to remember a thread where it was stacked 5 or so times, so it can't be as slow as other things I've written...
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