S
skylark
This topic deals with getting the optimum exposure for EACH photo when
scanning multiple photos at once on flatbed scanners.
First off, do typical (under $200) flatbed scanners adjust the physical
exposure time of the CCD based on the preview scan? I'm referring to
the hardware not software.
If so, then it would seem that if photos are scanned individually, the
optimum dynamic range for each photo could be captured. In contrast,
if multiple photos are scanned in one pass, then wouldn't the exposure
time have to be compromised if one photo was really dark and another
photo was really light?
What about scanning with no preview scan and with no auto corrections
set in the scanner? When I do this using Vuescan in raw mode, after I
crop the photos from the scan and look at the histogram in Photoshop,
the data is only in the middle portion with wide unused borders on the
left and right sides. Optimally I expected to see the histogram fill
the window with no clipping. If I set an auto setting in Vuescan to
get a histogram that fills the window, is it just doing that in
software which would be equivalent to doing the same thing using
Photoshop?
Finally, what if I gang scan multiple photos using my Canon 8400F
software in normal scan mode (not using the scanner's auto crop and
straighten). Then do the auto crop and straighten using Photoshop
Elements 4? Will I be losing dynamic range if there are dark and light
photos in the single scan? I want to do this to scan at higher
resolutions than the Canon auto crop and straighten software's 300 dpi.
Thanks for any insights,
Skylark
scanning multiple photos at once on flatbed scanners.
First off, do typical (under $200) flatbed scanners adjust the physical
exposure time of the CCD based on the preview scan? I'm referring to
the hardware not software.
If so, then it would seem that if photos are scanned individually, the
optimum dynamic range for each photo could be captured. In contrast,
if multiple photos are scanned in one pass, then wouldn't the exposure
time have to be compromised if one photo was really dark and another
photo was really light?
What about scanning with no preview scan and with no auto corrections
set in the scanner? When I do this using Vuescan in raw mode, after I
crop the photos from the scan and look at the histogram in Photoshop,
the data is only in the middle portion with wide unused borders on the
left and right sides. Optimally I expected to see the histogram fill
the window with no clipping. If I set an auto setting in Vuescan to
get a histogram that fills the window, is it just doing that in
software which would be equivalent to doing the same thing using
Photoshop?
Finally, what if I gang scan multiple photos using my Canon 8400F
software in normal scan mode (not using the scanner's auto crop and
straighten). Then do the auto crop and straighten using Photoshop
Elements 4? Will I be losing dynamic range if there are dark and light
photos in the single scan? I want to do this to scan at higher
resolutions than the Canon auto crop and straighten software's 300 dpi.
Thanks for any insights,
Skylark