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Re: [filter-effects] Color clamping of intermediate filter primitive results

From: Kristopher Giesing <kris.giesing@gmail.com>
Date: Tue, 23 Jul 2013 21:33:51 -0700
Message-ID: <CAAhnRF9NcFFsrFEJb5Xm8qvU-RukkWp+79yctDMYxRc7ns+n4w@mail.gmail.com>
To: Dirk Schulze <dschulze@adobe.com>
Cc: Rik Cabanier <cabanier@gmail.com>, "robert@ocallahan.org" <robert@ocallahan.org>, "public-fx@w3.org" <public-fx@w3.org>
Hi Dirk et al,

Don't you get different results depending on whether clamping happens at
each stage or only at the end?  It seems like this isn't just a performance
question, it's a behavioral question.

- Kris

PS. I've been lurking on this list for a while now, but this is my first
post. Hopefully I'm not overstepping etiquette by jumping in.

On Tue, Jul 23, 2013 at 4:41 PM, Dirk Schulze <dschulze@adobe.com> wrote:

> Again, we are about a complexity from linear to a constant in many cases.
> I think that this fact is worth it to questioning the "always-clamp". Even
> with better hardware and GPU acceleration in the future, this would still
> be a win.
> To your previous argument about the cache: Quite often the images are big
> enough to cause cache misses. And even if not, the speedup of one run in
> comparison to n runs over each pixel is huge.
> Greetings,
> Dirk
Received on Thursday, 25 July 2013 10:44:15 UTC

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