for a noprofit project I do shoot with (up to 5x) Canon HF100 camera(s) but, as stated in this interesting artile, it genetates a "custom RGB range" (16-255) files.
Thanks to this cool repository I've generated this GIF of 10s of source video:
http://www.forart.it/_priv/cultura/HF100_measurement.gif (33 Mb, so can't post. Click to watch)
It graphically shows how recorded video exceed the broadcast range.
The question is: how to "shift down" everything (and constrain inside broadcast range, of course) in order to preserve the maximum possible color quality ?
(note: someone already suggested me to use " Levels(0, 16, 255, 16, 235, coring=false) " in AviSynth but, if possible, I want to do it only with FFMPEG)
Thanks in advance to anyone that can/will help.