Re: [Openexr-devel] DWA compression

[Brendan Bolles]

On Aug 16, 2014, at 11:35 PM, Sean Y Chen wrote:

> 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. 


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.

Karl's has a nice write-up on the algorithm at the top of ImfDwaCompressor.cpp.


Brendan

main.cpp
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