Hi Paulo, Am 02.08.2013 um 21:14 schrieb Paulo Silva <paulo.jn...@gmail.com>:
> Somewhere in the loading some sort of alpha pre-multiplying is going on. Unfortunately the imageio-plugin load its files with premultiplied alpha, as you discovered already. The image-io-plugin does demultiply the alpha again, but can't restore rgb-values with alpha 0 and there are some rounding differences. Between 3.0 and 3.2 I added an optimization to use apples optimized demultipliying-algorithm instead of the prior home cooked version. If you are in need for exact rgba-values use libpng (just edit the cmake-files) or another image-plugin like rgba. cheers, Stephan
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