Epson 4870 scan historgram settings cut off at 10, 245?

  • Thread starter Thread starter peter
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peter

In Epson 4870's epson scan software, when in "professional" mode, the
historgram setting has both input and output limits default to 10, 245,
meaning anything darker than 10 will be output as 10, and anything brighter
than 245 will output as 245.

This means it loses 10 levels at the darkest and the brightest. Why is this
the default?
Wouldn't it be better to set the limits to 0, 255?
 
peter said:
In Epson 4870's epson scan software, when in "professional" mode, the
historgram setting has both input and output limits default to 10, 245,
meaning anything darker than 10 will be output as 10, and anything
brighter
than 245 will output as 245.

This means it loses 10 levels at the darkest and the brightest. Why is
this
the default?
Wouldn't it be better to set the limits to 0, 255?
Click to expand...
Can you change the histogram setting? Most scanners use the histogram to set
the black and white points.
 
Yes I can change it, but it's very annoying to have to set it everytime
before scanning.
Plus, I'm wondering perhaps there's a good reason for this setting to be
default.

I also tried vuescan, and it also defaults to something like that.
Strangely, I can change the upper limit to 255, but the lower limit cannot
be changed to 0.
 
peter said:
Yes I can change it, but it's very annoying to have to set it everytime
before scanning.
Plus, I'm wondering perhaps there's a good reason for this setting to be
default.

I also tried vuescan, and it also defaults to something like that.
Strangely, I can change the upper limit to 255, but the lower limit cannot
be changed to 0.
Click to expand...

Peter, go to Google Groups and look up my "2 easy exposure questions"
post from a few months ago. The answer was that settings below the
0-255 maximum might prevent pure noise from creeping in at the
extremes, as well as producing a dynamic range more faithful to the
original (since pure white and black aren't all that common). But the
Epson settings aren't tailored to individual images--it seems as
though they're always 10-245 for prints and 10-200 for negatives. And
they mess up the auto color correction when they're changed. So they
are annoying (like most of the Epson Scan design).

false_dmitrii
 
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