Re: colorsync-users digest, Vol 2 #444 - 9 msgs
Re: colorsync-users digest, Vol 2 #444 - 9 msgs
- Subject: Re: colorsync-users digest, Vol 2 #444 - 9 msgs
- From: email@hidden
- Date: Tue, 31 Jul 2001 13:06:00 EDT
In a message dated 7/30/01 10:17:59 PM Pacific Daylight Time, Bruce Lindbloom
on the email@hidden writes:
>
7) It would also have been nice to have a light trap as one of the patches.
>
This would be a square hole in the chart with a small box lined with felt
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(maybe here's where GretagMacbeth could use up their black flocking
>
inventory!) stuck on the back of the chart. The box could be folding for
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storage purposes. A light trap is very helpful in measuring the bias of the
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camera and optics (dark current and flare). This is _very_ useful
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information -- it's easy to build your own light trap out of two empty sets
>
of nesting 4 x 5 Ektachrome film boxes.
Bruce,
Interesting post and valid comments and suggestions for Gretag.
I've been a professional photographer for over 30 years and don't know what
you're talking about regarding this "light trap". Could you expound on that a
bit. Exactly what is it and what does it do?
Thanks,
Joe Butts