I updated the code for ImageBufAlgo::composite: https://github.com/StefanStavrev/oiio/commit/31c7ae27bc3b64959abb78607e6383f6011ba9ed
I tested all Porter-Duff operations with transparency, without transparency and with image offsets: 1. Without transparency: http://postimage.org/image/x8attcuyv/ 2. With transparency: http://postimage.org/image/7wbr6cko7/ 3. With offsets: http://postimage.org/image/jwj1tbykb/ What you see as white is actually fully transparent as it is supposed to be, where both iterators are not valid. If you ask me, we should create a pull request, while I have this clean commit where you can clearly see the changes. We don't have to work on it right away though, we have to finish histograms first. Stefan
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