Digital BW, The Print

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

-----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




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