[Gegl-developer] new GEGL samplers: what they are and where they are going

[Nicolas Robidoux]

RE:

> ===
> Upsharp sampler
> ===

> ...

> Future improvements: ...Finally, current research
> suggests that the co-monotonicity enforcing derivative clamping is
> overkill and that the result would be less aliased without a
> noticeable increase in haloing if it only enforced strong boundedness.

More current research suggests that the standard "three times the
difference" rule (Fritsch and Carlson et al) is just about as good as
it gets, so this future improvement won't be.

Nicolas Robidoux
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Re: [Gegl-developer] new GEGL samplers: what they are and where they are going (REVISED)

[Martin Nordholts]

On 09/01/2009 04:22 PM, Nicolas Robidoux wrote:
> 
> 
> Abstract
> 
> 
> Eric Daoust and Adam Turcotte are about to wrap up a pair of Google
> Summer of Code 2009 projects having to do with new samplers.  In this
> document, I explain what the samplers do, how they (may) fit within
> the GEGL library, and where they are going (most likely: feedback
> would be nice).
> 
> I also briefly indicate what will need to be done when non-affine
> transformations (perspective, warp) are implemented in GEGL so that
> they use the samplers tuned for downsampling (for example, thumbnail
> production) with maximal benefit.

Thanks a lot for this detailed info

I'll make sure that your work is merged to master sooner or later (but it could 
take a while before I find the time to do it)

BR,
Martin
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