Re: DWA compression

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]
>
>
>
>
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>

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