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Color space Police!
- To: <telecine at sun.alegria.com>
- Subject: Color space Police!
- From: Rich Torpey <72456.1217 at CompuServe.COM>
- Date: 22 May 97 13:14:55 EDT
- Old-Return-Path: <72456.1217 at CompuServe.COM>
- Resent-From: telecine at sun.alegria.com
- Resent-Message-ID: <"vDpa8.A.B8C.k9Hhz" at sun>
- Resent-Sender: telecine-request at sun.alegria.com
- Resent-To: multiple recipients of <telecine at sun.alegria.com>
Many of the issues in color space don't apply to the telecine suite as
much as the do to transmission. The telecine suite is usually working in YUV
space which has the broadest possible color space (independant chroma/luma,
signals can be positive or negative however the chroma signals are
bandwidth limited). The next stage is RGB space (subset of YUV, positive
signals only, interdependant chroma/luma, full bandwidth components). The
final stage in the US is NTSC where the chroma components are modulated onto
a 3.579545mhz subcarrier which is then impressed upon the luminance signal.
The limitations of those subcarrier and luminance amplitudes are due to the
AM TV transmitters used for broadcast as well as the ability of composite
analog vtrs to reproduce the signal.
So, the bottom line is - where do you want to be legal? RGB (any computer
platform - Flame, Mac, etc.) or Composite (Broadcast, etc.)? The best bet is
to determine your end user and work with their requirements.
mailinglist digest available......posting guidelines on the webpage