Where should i call colormatrix()?

bxyhxyh · 26th February 2014, 17:08

I'm upscaling some DVDs.
Upscaling means i have to set correct color.

Code:

#source
#pre upscale filters
Spline36Resize(960,720)
Colormatrix("Rec.601->Rec.709") #Is it correct to call here? Or should i call it after post upscale filters?
#post upscale filters

turbojet · 26th February 2014, 23:08

Should be good although I've been putting at the end of the script for years and never had an issue.

Groucho2004 · 27th February 2014, 00:09

Quote:

Originally Posted by turbojet

Should be good although I've been putting at the end of the script for years and never had an issue.

Hm, I've been putting it always right after the source filter, i.e. DGDecode(NV).

Gavino · 27th February 2014, 01:19

The order doesn't matter - the result should be the same (except possibly for random rounding differences).

Guest · 27th February 2014, 01:48

Wouldn't it be marginally more efficient to apply colormatrix to the clip in its smallest frame dimension?

bxyhxyh · 27th February 2014, 07:45

If i call it after source filter, color is changed after upscale.
So I'll do as Gavino said.

Thanks for your answers.

Gavino · 27th February 2014, 10:26

Quote:

Originally Posted by bxyhxyh

If i call it after source filter, color is changed after upscale.

There should be no visible difference between

Spline36Resize(960,720)
Colormatrix("Rec.601->Rec.709")

and

Colormatrix("Rec.601->Rec.709")
Spline36Resize(960,720)

neuron2 is correct that the second will be marginally more efficient.

hello_hello · 27th February 2014, 23:41

Nobody uses the clamp setting?

ColorMatrix(mode="Rec.601->Rec.709", clamp=0)

manono · 1st March 2014, 01:01

Quote:

Originally Posted by hello_hello

Nobody uses the clamp setting?

Me, me, me, me.

Except I'm usually downscaling from Hi-Def to DVD video.

26th February 2014, 17:08	#1 \| Link
bxyhxyh Registered User Join Date: Dec 2011 Posts: 354	Where should i call colormatrix()? I'm upscaling some DVDs. Upscaling means i have to set correct color. Code: #source #pre upscale filters Spline36Resize(960,720) Colormatrix("Rec.601->Rec.709") #Is it correct to call here? Or should i call it after post upscale filters? #post upscale filters Last edited by bxyhxyh; 26th February 2014 at 17:10.

26th February 2014, 23:08	#2 \| Link
turbojet Registered User Join Date: May 2008 Posts: 1,840	Should be good although I've been putting at the end of the script for years and never had an issue. __________________ PC: FX-8320 GTS250 HTPC: G1610 GTX650 PotPlayer/MPC-BE LAVFilters MadVR-Bicubic75AR/Lanczos4AR/Lanczos4AR LumaSharpen -Strength0.9-Pattern3-Clamp0.1-OffsetBias2.0

27th February 2014, 01:19	#4 \| Link
Gavino Avisynth language lover Join Date: Dec 2007 Location: Spain Posts: 3,431	The order doesn't matter - the result should be the same (except possibly for random rounding differences). __________________ GScript and GRunT - complex Avisynth scripting made easier

27th February 2014, 01:48	#5 \| Link
Guest Guest Join Date: Jan 2002 Posts: 21,901	Wouldn't it be marginally more efficient to apply colormatrix to the clip in its smallest frame dimension?

27th February 2014, 07:45	#6 \| Link
bxyhxyh Registered User Join Date: Dec 2011 Posts: 354	If i call it after source filter, color is changed after upscale. So I'll do as Gavino said. Thanks for your answers.

27th February 2014, 23:41	#8 \| Link
hello_hello Registered User Join Date: Mar 2011 Posts: 4,829	Nobody uses the clamp setting? ColorMatrix(mode="Rec.601->Rec.709", clamp=0)