Low Precision of Cube luts with YUV 8-bit inputs

[Selur]

Atm. there are multiple ways about this:

• You can enable the 'Gimmick'-Option (Filtering->Vapoursynth->
  
• you could add a Filtering->Vapoursynth->Custom section before it and insert
  
  # requires RGB48
• if you are aiming for 16bit output anyway, activating 'Filtering->Vapoursynth->Source->Convert to target color space after source filter'
  
• do it like you did
  

But I agree, that the Gimmick options should be available for ColroMatrix and TimeCube.
=> Will add an option later today after work.

Cu Selur