Through visual inspection of the
VirtualDub histogram, I arrived at what I thought was safe software procamp settings for 710-USB. To confirm, I cropped out enough to avoid blanks and head-switching bands during this exercise.
I am now inspecting the RT_YStats for the captured lagarith AVI segments logging YMin, Ymax, Low# - no. of pixels with Y<=16, High# - no. of pixels with Y>=235, TYMin & TYMax - YMin & YMax for a given threshold; pixels with extreme Ys seem to occur on the edges, and these mostly disappear post QTGMC. The right clip is from
Code:
Limiter(min_luma=17, max_luma=234, show="luma_grey")
.
I see that only very few frames, that too with very few pixels, have boundary values of Y<=16/Y>=235, even for a very low threshold value of 0.01%. If I look for loose YMin/YMax [threshold = 0.4%], there are just one or two frames that have Y<=16/Y>=235 for a ~14,000 frame clip.
Shot-01.jpg
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I feel that the current proc-amp contrast levels are set too low and I could afford to crank up the contrast a bit, tweaking the brightness levels accordingly.
Please suggest if there is a recommended threshold value that I could use to inspect Y levels? Do the loose Min/Max values with threshold of 0.4% have any significance and so can be a recommended threshold?
Many thanks.
