[GUIDE] Colour Change with Hybrid & QTGMC Deinterlacing

[Selur]

The delinterlacing has worked well, perhaps a little bit too smooth but otherwise excellent.

Adjusting settings like 'Lossless', 'SourceMatch' and a few other parameters that could be set throught he 'Addition' line edit, could be used to help with that. (QTGMC has tons of parameters Hybrid doesn't offer in the GUI,..

QTGMC(Input, Preset='Slower', TR0=None, TR1=None, TR2=None, Rep0=None, Rep1=0, Rep2=None, EdiMode=None, RepChroma=True, NNSize=None, NNeurons=None, EdiQual=1, EdiMaxD=None, ChromaEdi='', EdiExt=None, Sharpness=None, SMode=None, SLMode=None, SLRad=None, SOvs=0, SVThin=0.0, Sbb=None, SrchClipPP=None, SubPel=None, SubPelInterp=2, BlockSize=None, Overlap=None, Search=None, SearchParam=None, PelSearch=None, ChromaMotion=None, TrueMotion=False, Lambda=None, LSAD=None, PNew=None, PLevel=None, GlobalMotion=True, DCT=0, ThSAD1=640, ThSAD2=256, ThSCD1=180, ThSCD2=98, SourceMatch=0, MatchPreset=None, MatchEdi=None, MatchPreset2=None, MatchEdi2=None, MatchTR2=1, MatchEnhance=0.5, Lossless=0, NoiseProcess=None, EZDenoise=None, EZKeepGrain=None, NoisePreset='Fast', Denoiser=None, FftThreads=1, DenoiseMC=None, NoiseTR=None, Sigma=None, ChromaNoise=False, ShowNoise=0.0, GrainRestore=None, NoiseRestore=None, NoiseDeint=None, StabilizeNoise=None, InputType=0, ProgSADMask=None, FPSDivisor=1, ShutterBlur=0, ShutterAngleSrc=180, ShutterAngleOut=180, SBlurLimit=4, Border=False, Precise=None, Tuning='None', ShowSettings=False, ForceTR=0, TFF=None, pscrn=None, int16_prescreener=None, int16_predictor=None, exp=None, alpha=None, beta=None, gamma=None, nrad=None, vcheck=None, opencl=False, device=None)

source: https://github.com/Selur/VapoursynthScri...nc.py#L892

The only problem is that the colours are not quite the same as the colour grading.

Too vague to know what could be happening,...

I have tried playing around with Colour Matrix settings in both the QTGMC and FFMPEG by varying the from and to colour spaces between Rec.601 and Rec.709, but this does not seem to affect the result.

No clue what you are doing, first time I hear about QTGMC having a color matrix settings,....
Since there should be RGB<>YUV-conversion when applying QTGMC to YUV and saving it as YUV content sticking with the original color signaling data should be fine.

I wonder whether the noise reduction may have suppressed some chrome noise that affected the apparent colour?

I doubt it, but sure everything is possible.

The saturation seems to be slightly less, the reds are slightly muted and some shots seem to be slightly green.

Maybe some tv (15-235) vs. pc (0-255) scale luma issue?

Do you have any suggestions on how I could make the colours identical between the input and output files please?

No, maybe some users which use ProRes can suggest something, but for me it's all to vague.

Cu Selur