what is it?
below threshold (a.k.a. "under threshold") is a general effects plug that can set all pixels that are below a threshold in red, green, and blue to a color you specify.
what should I use it for?
this plug is extremely useful whenever you are filming against a dark background (e.g. grey, black) and want to eliminate reflections (for later matting effects) or slight irregularities in a background. you can also use it to change the color of a dark background to any color you like.
note that there is a second plug called 'above threshold' that does the opposite: set all pixels that are above a certain level to a color you specify.
area of effect :
Define the area of the clip you want to be affected by the plug-in. All other parts of the clip remain untouched.
choose the color that a pixel that exceeds the threshold shall assume.
red, green, blue:
set a threshold for each channel red, green, and blue. note that a pixel must be below all three levels to trigger the effect.
AND all channels:
the default method for testing against the red, green, and blue threshold is that all channels must exceed their thresholds. if you uncheck this box, it is sufficient that at least one channel is above the threshold.
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