Minolta 5400 profiling woes
Minolta 5400 profiling woes
- Subject: Minolta 5400 profiling woes
- From: Armand Rosenberg <email@hidden>
- Date: Thu, 11 Dec 2003 10:43:46 -0500
I've been struggling with profiling a Minolta 5400 scanner. To
paraphrase the old song, "the war is over and the good guys lost." At
least for now.
In a nutshell:
I have now tried profiling this scanner both using the Minolta driver
and VueScan (yesterday's version) with a transparency IT8 target. In
the end, the behavior is the same. After I create the scanner
profile, subsequent scans done with the same exposure settings come
in too dark. By this I mean that the histograms on subsequent scans
(after assigning the custom profile) end well below the 250 or so
level, sometimes as low as 140 or so. I can of course do a Levels
adjustment on these 16-bit scans, but it doesn't seem right to have
to perform a major adjustment like this.
The settings:
- In Minolta sw, choose NO auto exposure.
- In VueScan, choose Lock Exposure and Lock Color (and save a .INI
option for later use).
In both cases, I use the histogram to set the white and black points
during the target scan. These values are then retained (I can see
they are still there before each scan).
The initial target scan (unprofiled) looks good: gs11 about 100-110,
black/white gs endpoints at about 10 and 250. Surprisingly, scanning
the target again after the settings have been locked, and assigning
the custom profile also yields a good scan. But scanning any other
image in this way yields a dark scan. The target is on the same film
(nominally) as the images being scanned (Provia, target from Wolf
Faust).
If I profile as above but do NOT lock down the settings for
subsequent scans, allowing auto-exposure to occur with every scan,
then the results are reasonable. This is true with both Minolta sw
and VueScan. But everything I've read about scanner profiling says
this is the wrong way to work.
Can anybody help? If someone has successfully done this, could you
let me know the settings you used (off-line, if you prefer)?
Thank you.
Armand
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