Where should i call colormatrix()?

[bxyhxyh]

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


#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]

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

[Groucho2004]

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]

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

[Guest]

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

[bxyhxyh]

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

Thanks for your answers.

[Gavino]

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]

Nobody uses the clamp setting?

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

[manono]

Nobody uses the clamp setting?

Me, me, me, me.

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