digitalFAQ.com Forum - How to colour grade VHS captures in Avisynth?

JVC HR-DVS3U --> AVT-8710 --> Pinnacle 710-USB

I check histograms before capture following Sanlyn's http://www.digitalfaq.com/forum/vide...-settings.html :salute:

I have an intermediate understanding of color theory. I have experience in Photoshop and DaVinci Resolve. (All RGB colour spaces, mind you). But I know how to make white :congrats:

I am processing my captures in AviSynth using AvsPmod, working in YUV colour space.

I have one particular tape that I'm trying to colour grade. Its an hour-long wedding video. It was poorly filmed to begin with, and I suspect a couple generations away from the original. Colours are washed out and inconsistent from minute to minute. Very dark indoor scenes and very bright outdoor scenes.

I have been trying to colour grade this tape as a whole rather than splitting it up -- mainly because there are several instances within the same shot where the histograms vary wildly. Because of these inconsistencies, I've selected conservative values in an attempt to keep legal levels across the tape.

I've adjusted the levels (y value) to appropriate values -- or at least I think I have. Correct me if I'm wrong.

I have offset the red projection (v value) by 10 to make (most of) the whites white.

The trouble I'm having now is that my highlights are too green, and my shadows are too red. I know how I would fix this in Photoshop, but not in AviSynth in YUV colourspace. Is there a way to adjust the highlights, midtones, and shadows independently? Or perhaps an alternative fix?

Script and Raw samples attached below.

Code:

FFmpegSource2("RAW1.avi",atrack=1)

ColorYUV(off_y=0, off_u=0, off_v=10, cont_u=0 ,cont_v=0)

Levels(-5, 0.9, 265, -5, 275, coring=false, dither=true)

Tweak(sat=1.0, coring=false, dither=true)

BilinearResize(720,540)

Crop(16,0,-8,-2)

Histogram("Levels")

AddBorders(12,0,12,2)