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I want to test some demosaicing algorithms. My files are custom Bayer CFA images stored as png files. I want to convert them into a popular raw format and load them into software like RawTherapee to perform demosaicing on them.

Do you know a tool or toolchain to achieve this?

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The data in the PNG is actually unpreprocessed RAW data? –  horatio Dec 11 '13 at 20:19

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