in praise of RawTherapee, "Amaze" demosaicing algorithm

Started Jun 10, 2011 | Discussions thread
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RussellInCincinnati
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in praise of RawTherapee, "Amaze" demosaicing algorithm
Jun 10, 2011

"Pictus" pointed out that the Amaze de-mosaicing algorithm might help with color moire (false color) patterns that emerge at times from our no-AA antiAliasing filter Nex 3/5 cameras.

Copied RawTherapee ( http://rawtherapee.com/downloads ) into my PC, it doesn't really need to be "installed", it just runs immediately in whatever folder you copy it into. Nice.

Redeveloped an old raw file that had been processed and looked good. It had been developed using the AHD de-mosaicing built into Picture Window Pro. But now, re-ran it in RawTherapee using max (5-pass) false color suppression. Sharpening turned off. "Amaze" demosaicing algorithm selected. Result:

  1. False color moire patterns indeed 20% to 50% less noticeable, excellent.

  2. Surprisingly, final sharpness of image (after unsharp mask in Picture Window Pro) also better compared to AHD interpolation.

  3. Even more surprisingly, less noise with RawTherapee/Amaze, even though sharpness better.

Thanks, Pictus, for starting a good train of thought.

Amaze algorithm seems to (with perfect lens, tripod, ISO 200 etc) wring that last bit of clarity out of the Nex sensor that we've all suspected is there. Meaning pretty nice 3 foot diagonal enlargements, see sample image in next post.

Cautionary note that several places on web comment that the Amaze algorithm is not so ideal for noisy images.

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