-----Original Message-----
From: johngeyles <jge@...> [mailto:jge@...]
Sent: Wednesday, February 19, 2003 11:59 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] error in 21-step wedge ?
I recently downloaded a 21-step wedge from some pointer is this
group. The file was called '21stepNew.jpg'.
I think there's a slight error, of scaling, in the file. In
Photoshop Image Size, the size is listed as 3 x 9.6", at
300 pixels/inch.
But the 7.2 lp/mm resolution target has 2 pixels per line pair.
This means the resolution SHOULD be 144 pixels/cm to make the
resolution target be printed at correct scale. Which is somewhat
different than 300 pixels/inch. This scaling error applies
to the other resolution patterns as well.
Of course, the simple fix is to change the rez to 144 pixels/cm,
(without resampling, of course). The size then becomes about
2.4 x 7.9".
John
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