RE: [Digital BW] EP2450 lamp banding
2002-02-04 by Alessandro Pardi
I think that (most) film scanners have the same problem, too, although I can't tell how pronounced it can be until it gets visible in actual scans. Alessandro Pardi
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-----Original Message----- From: Alan Zinn [mailto:AZinn@...] 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 [Non-text portions of this message have been removed]