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Internet Message Format | 1995-11-07 | 3KB

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         (from Ernie Wright <[e-mail]>)
         (at Mon, 30 Oct 1995 23:16:51 -0800)
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From: [e-mail] (Mark Thompson)
To: [e-mail]
Subject: Re: Color Match,n
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Ernie Wright <[e-mail]> writes:
> J. Eric Chard wrote:
> >     It seems to me (hah!) that this would be a hardware issue:  if your
> > encoder will translate certain RGB values into illegal NTSC signals, well,
> > it's hardware....
>
> That's about how far I got.  I guess that's why I'm not an engineer.

The problem is, its impossible for the encoder to do the right thing
because it has no way of knowing what the right thing is. If the video it
is getting is legal, it should be passed untouched. If its heavily over
saturated, the chroma should be reduced. If its too hot, the luminance gain
should be dropped. But these changes must occur across the entire image for
the duration of the sequence (or else disturbing visual effects will be
created), and the encoder has no way of knowing how to adjust what in
advance. Some encoder simply clip the signals, but this looks pretty
shabby. The real solution (other than to always give it legal values), is
to put a good proc amp on the output and allow the trained operator to set
it accordingly.
     *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*
     *           Mark Thompson                  [phone]    *
     *         Fusion Films, Inc.             [e-mail]  *
     * Director of Animation and Special FX                       *
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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