[Bf-compositor] [ENH] Sampling

[Francesco Paglia]

Hi Troy your post seems very interesting to me, in fact the discussion
about sampling is already on in another thread, I kindly suggest you to
join Jeroen and Lukas there.



2013/11/3 Troy Sobotka <troy.sobotka at gmail.com>

> Nice to see Sebastian bringing up the subject of sampling. Apologies
> for giving it its own thread, but I feel the importance is huge in
> quality imaging. Many discussions previously have ended up in the dust
> pile sadly, so a tremendous thanks to Sebastian for rekindling the
> discussion.
>
> Sampling is quite horrific in Blender due to only the cubic b being
> implemented by default for the higher quality interpolations. While
> this might all sound too techy, anyone that has dealt with purely
> creative output probably has slammed into this issue.
>
> While sharper, Lanczos[1] and other such approaches tend to result in
> halos during stair / repeated applications.
>
> Having the ability to apply particular sampling approaches per node
> might be worth considering. Perhaps a node input to determine type
> given the plethora of contextual needs?
>
> I would implore everyone to have a peek at the prefilter applied to
> cubic b. I've done up a few attempts at nodes that are likely out of
> date, but sadly require a much lower level integration in the current
> compositor because of the need for a separate image buffer[2][3].
>
> The interpolation was first brought to my attention via Matthias
> Fauconneau ages ago. I do not believe this interpolation approach has
> landed in any mainstream imaging applications, but as any individual
> interested in imaging would likely attest after having experimented
> with it, it is one of best baseline interpolations available,
> suffering from none of the hyper sharpening / blurring. It also offers
> perhaps the most organic looking interpolation available.
>
> [1] http://en.wikipedia.org/wiki/Lanczos_resampling
> [2] http://www.youtube.com/watch?v=nfhTET86kdE (watch in HD to see the
> perceptual sharpness results)
> [3]
> http://wiki.blender.org/index.php/User:Sobotka/Cubic_B-Spline_Scaling_Algorithm
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-- 
Francesco Paglia
Vfx and Production Supervisor

mobile  +39 347.82.12.473
e-mail   f.paglia.80 at gmail.com
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