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Old 14th December 2007, 19:19   #1  |  Link
adoniscik
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Join Date: Dec 2003
Location: Brookline, MA
Posts: 76
What is the gamut of video?

I want to compare the SD and HD gamuts. I understand that the former uses ITU-R BT.601 while the latter uses ITU-R BT.709 primaries.
  1. How wide is the NTSC output (TV) gamut? Do manufacturers set the primaries arbitrarily depending on the display technology (e.g., CRT vs. LCD) or are they fixed? If so, to what, SMPTE-C?
  2. How wide is the NTSC input (DVD) gamut?
  3. What if the DVD is viewed through a computer instead of CRT? Logically, if DVDs are assumed to use rec.709 primaries, then you should perform a color space conversion from BT.709 to the color space of your monitor to get accurate color. The gamut is defined by BT.709.
Aren't "primaries" a relic from the CRT era? Digital videos are encoded in luma-chroma color spaces rather than RGB. You could conceivably build a multi-primary display (and some have).

Addendum: color management for film

Last edited by adoniscik; 14th December 2007 at 21:17.
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