FotoDave@aol.com
Sun, 24 Jan 1999 23:49:52 -0500 (EST)
In a message dated 1/24/99, AM 02:54:24, alt-photo-process-l@skyway.usask.ca
writes:
<<I gather from someone else's message that the "defect" correction can be
turned off. (But don't you just hate it when computers "think" for you?)
Judy, this is right because these correction functions given by scanners
software are relatively crude compared to Photoshop, so you can do the same
thing in Photoshop. The important thing is once you capture the raw data, you
can manipulate it with a more powerful software than the scanners' software.
The exception is when you work with curves or gamma, then it is best to do
this with the scanners software because the scanner can scan at a higher bit
depth (for example, 12 bit) and do the gamma or curve calculation on the
12-bit data and finally convert to the 8-bit file that you need. The result is
like carrying your calculation with more decimal points than you needed and
only round the final result.
Of course you can do this in Photoshop too, but you will have to scan at 12
bit (and get a BIG file), change the curve or gamma as you like, and then
convert it back to 8 bit.
I remember you also asked another question about dynamic range although I
can't find it now, but higher dynamic range will help in this kind of
situation as well. It will allow you to capture more details in shadow, for
example, do the calculation and conversion and rounding.
Dave
At the stage I am now, I suspect all those adjustments of being more sales
"features" than intrinsic functions, although when/if I get fully
functional myself, I may learn otherwise. At this point, I almost always
find adjustments better made in Photoshop than in the scan when using the
flatbed scanner. Again, that may be my own lack of finesse, but for sure
the Photoshop software is easier to use.>>
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