From: Judy Seigel (jseigel@panix.com)
Date: 05/17/00-03:15:11 PM Z
On Tue, 16 May 2000, Nick Makris wrote:
> Judy and Eric,
>
> I also have recently printed a 21 step negative which didn't provide any
> enlightenment - it printed just fine. Once again, I have no densitometry so
> I am unable to compare the steps to the areas in question.
Nick, that's what you do with the white cards: punch holes with an office
punch in two white cards. Put one hole over the area you want to "match"
in the step tablet, then run other hole over the print until it matches
(or vice versa). The human eye is SURPRISINGLY sensitive in this kind of
matching -- in fact early densitometers relied on operator matching tones
by eye.
Judy
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