Digital BW, The Print

Depending on your goals and methods, the readings _before_ linearization
from so many steps can be helpful to determine if your measured curve is
smooth enough for the linearization to “work”, i.e. the humps and dips are
not very large or abrupt.
Using measure tool with my eye-1 in strip scan mode, the noise is low enough
to resolve 1024 gray patch steps; rather surprising in itself.  That said, I
don’t believe you need large numbers of patches for QTR to linearize well.
I believe Roy is pleased with the 21 patch x 4 reading approach.

Best regards,
John Moody

-----Original Message-----
From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com]On Behalf Of horstenj
Sent: Wednesday, September 20, 2006 12:38 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] 256 Gray Random Target for QTR

Actually 256 steps might not even work. You'll definitely get some
noise/random errors in the measurements that might very well be
larger then the differences in the steps. The QTR linearization
algorithm expects a monotone series of numbers. Even if the steps
are not large enough the algoritm can complain, as a experienced
recently.



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