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From: | Hồ Châu |
Subject: | [Openexr-devel] Về: DWA compression |
Date: | Thu, 21 Aug 2014 03:07:21 -0700 |
On Aug 16, 2014, at 11:35 PM, Sean Y Chen wrote:Here's the code for the little program I wrote to generate those sequences. I'm basically doing compression = pow(10.0, frame / 25.0), with frames going from 0-149. I wouldn't say it's perceptually linear exactly, although if you look at the MtTamWest example where I show difference mode, the diff seems to come in pretty linearly.
> In Brendan Bolles's demo video, it seems that 100000 is the limit for a couple of the images, though one of them goes to 250000 before reaching file size 1.
Karl's has a nice write-up on the algorithm at the top of ImfDwaCompressor.cpp.
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