I have 0 technical expertise on this algorithm, but perhaps an idea for the slider would be to use it for setting target file size. I don't know if the algorithm allows for this or if that is even practical. 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. Anyways, just ramblings from a musician/amateur coder.
Cheers, Sean On Sun, Aug 17, 2014 at 2:07 AM, Larry Gritz <[email protected]> wrote: > The new compression modes are really great, thanks. I've been playing > around with it and it performs very well, great compression while retaining > visual quality. > > But the numbers are confusing. Apologies if I missed prior discussion of > this point, but does anybody have an explanation of what the value means? > I understand the basics -- higher is more compressed, below 100 gives > nearly perfect visual fidelity -- but maybe because the scale is unbounded > and highly nonlinear, I haven't been able to come up with an > easy-to-explain description. In contrast, the 1-100 scale for JPEG quality > has a more intuitive feel that, while still not linear, seems to be no > trouble to wrap one's mind around (maybe because it reminds us of > percentages?) and is much more amenable to putting into a UI slider. I'd > love to find an equation that would map an intuitive 0-1 or 0-100 scale > inside an app to the dwaCompressionLevel in an analogous way. > > -- > Larry Gritz > [email protected] > > > > > _______________________________________________ > Openexr-devel mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/openexr-devel >
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