gamma on resizers

Dogway · 2nd January 2011, 03:43

long ago I came to this page where was explained the flaws of average scaling methods. So when I wanted high quality resizes Id choose float point based resizing in Photoshop, although narrowing the options to bilinear. Now that there are wonderful resizers in avisynth and some plugins work in float point (smoothadjust,dfttest), wouldn't it be possible to implement this?

PD: didn't want to dig grave the splineresize thread.

Lyris · 2nd January 2011, 05:49

+1 - has anyone implemented linear light scaling in AviSynth?

jmac698 · 2nd January 2011, 08:39

I'm sure it could be done in masktools.
I doubt avisynth is gamma-aware.

LaTo · 2nd January 2011, 11:26

Yes it's possible to implement this, but it will be slower...

Because all calculations will be at least in 16bits instead of 8bits (to avoid big rounding errors with gamma)

And most of the time the difference is small on real videos.

Gavino · 2nd January 2011, 11:56

This has been discussed in the past:
http://forum.doom9.org/showthread.php?t=134192

Dogway · 2nd January 2011, 13:38

Thanks for the link, I tried the photoresize function. Ignoring the scaling quality comparison many artifacts were introduced (ringing,red blocking in darks)
spline64
Photoresize
I guess they are waiting for Avisynth 2.6 (?)
I like using avisynth as an still image processor, I know I could do better moving to matlabs, but I come from the CG field, coding is not my strong...

2nd January 2011, 03:43	#1 \| Link
Dogway Registered User Join Date: Nov 2009 Posts: 2,372	gamma on resizers long ago I came to this page where was explained the flaws of average scaling methods. So when I wanted high quality resizes Id choose float point based resizing in Photoshop, although narrowing the options to bilinear. Now that there are wonderful resizers in avisynth and some plugins work in float point (smoothadjust,dfttest), wouldn't it be possible to implement this? PD: didn't want to dig grave the splineresize thread. __________________ i7-4790K@Stock::GTX 1070] AviSynth+ filters and mods on GitHub + Discussion thread Last edited by Dogway; 2nd January 2011 at 07:28.

2nd January 2011, 11:26	#4 \| Link
LaTo LaTo INV. Join Date: Jun 2007 Location: France Posts: 701	Yes it's possible to implement this, but it will be slower... Because all calculations will be at least in 16bits instead of 8bits (to avoid big rounding errors with gamma) And most of the time the difference is small on real videos. __________________ AutoAdjust SmoothAdjust MCTemporalDenoise LSFmod GradFun2DBmod

2nd January 2011, 11:56	#5 \| Link
Gavino Avisynth language lover Join Date: Dec 2007 Location: Spain Posts: 3,437	This has been discussed in the past: http://forum.doom9.org/showthread.php?t=134192 __________________ GScript and GRunT - complex Avisynth scripting made easier

2nd January 2011, 13:38	#6 \| Link
Dogway Registered User Join Date: Nov 2009 Posts: 2,372	Thanks for the link, I tried the photoresize function. Ignoring the scaling quality comparison many artifacts were introduced (ringing,red blocking in darks) spline64 Photoresize I guess they are waiting for Avisynth 2.6 (?) I like using avisynth as an still image processor, I know I could do better moving to matlabs, but I come from the CG field, coding is not my strong... __________________ i7-4790K@Stock::GTX 1070] AviSynth+ filters and mods on GitHub + Discussion thread Last edited by Dogway; 3rd January 2011 at 10:59.

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2nd January 2011, 05:49	#2 \| Link
Lyris Registered User Join Date: Sep 2007 Location: Europe Posts: 602	+1 - has anyone implemented linear light scaling in AviSynth?

2nd January 2011, 08:39	#3 \| Link
jmac698 Registered User Join Date: Jan 2006 Posts: 1,869	I'm sure it could be done in masktools. I doubt avisynth is gamma-aware.