I mean the actual pixel values rather than the output signal or data type. Effectively a colour correction to flatten the video curve prior to interpolating more pixels for the scale. If you think of a black pixel and a white pixel next to each other , the simplest interpolation is to generate a pixel between them thats 50% . If the pixel values themselves are nonlinear that 50% will be slightly skewed as a result.
|Originally posted by Charles Black|
I have checked the ffdshow luma output exhaustively with a scope and test signals and it is linear as expected. I checked chroma ranges and they were as expected as well. My chroma experience is limited to a few samples though and would not have been able to see any chroma errors other than range.