EP2450 lamp banding
2002-02-03 by Alan Zinn
Guys,
I did a test of the evenness of the Epson 2450 scanner cool-light lamp as
suggested by Tim A.. I scanned the plain lamp and 6 x 6 in. No.2 and No.5
multigrade filters. I gave the lamp time to warm up. There is a noticeable
density change (brighter) in the middle third of the long axis in the filter
scans. I selected adjust/equalize in PS and it is then quite pronounced. I
have seen similar enlarger lamp un-eveness. I wonder if this is a
shortcoming of all cool-light lamp scanners and is it asking a bit much of
any flat bed transparency scanner?
But hold on - what about a reflective scan of a white sheet of paper? I
checked that and got un-evenness when I applied equalize. What's up with that?
Is this a serious problem for high-key images? A mask that matches the
density of the lamp could easily be made in PS.
AZ
Maker of Lookaround panoramic camera.
www.geocities.com/soho/gallery/8874/
or
keyword.com lookaround