RGB exposure value in Vuescan

  • Thread starter Thread starter Robert Feinman
  • Start date Start date
R

Robert Feinman

I thought I knew what this value does, but now I'm confused again.
When using the Epson 4870 this number gets set after doing a preview.
Depending on the film being scanned it is usually around 2.2 for me.
I've tried changing this manually to see if I could get the low values
to move away from 0, but it doesn't seem to have much effect until
I go up to 12 or so.
Does this value do anything, or is it only meaningful on some
models of scanners?
 
Robert Feinman said:
I thought I knew what this value does, but now I'm confused again.
When using the Epson 4870 this number gets set after doing a preview.
Depending on the film being scanned it is usually around 2.2 for me.
I've tried changing this manually to see if I could get the low
values
to move away from 0, but it doesn't seem to have much effect until
I go up to 12 or so.
Does this value do anything, or is it only meaningful on some
models of scanners?

--
Click to expand...
Hi Robert,

Did you make sense of the text in the "Vuescan FAQ - Input Tab -
RGB/Infrared exposure" ?

To me it seems that is some rare cases you could increase the value
for extreme contrasty negatives. I also would like to know more about
this subject...
 
SNIP
Does this value do anything, or is it only meaningful on
some models of scanners?
Click to expand...

It's functionality depends on the scanner. Some scanners don't allow
to change it (I think the option is hidden then), some only change in
certain steps, and others allow fine exposure time control (as
witnessed by a change in scan time).

Depending on the version of VueScan you use, you may also want to
check against another version, to see if anything changed in VS.

Bart
 
Back
Top