[sane-devel] Making neutral scans

Grant emailgrant at gmail.com
Fri May 21 23:10:15 UTC 2010

>>>>>>> Not at all. I've seen two different units of the same scanner give
>>>>>>> very different tone scans with the same options set. You need a
>>>>>>> reference target to scan.
>>>>>>> allan
>>>>>> But color management can be used after the fact, right?  I'd like to
>>>>>> have a reference copy of everything I scan that I can apply things
>>>>>> like color management or unsharp mask to later on.
>>>>> Yes- if the colors are reasonable, a profile specific to that machine
>>>>> could be used to clean it further
>>>>> allan
>>>> So if I make sure my gamma correction is always at 1.8 and I always
>>>> leave all the sliders alone, I should be able to produce consistent
>>>> reference scans that I can apply the same set of adjustments (ICC
>>>> profile, maybe others) to later on to produce something as accurate as
>>>> possible?
>>>> I just want to make sure I'm not forgetting anything.
>>> In theory, yes. But software upgrades might change a calibration algo,
>>> and the sensors and lamp will drift over time, and the temperature in
>>> the room will change, which might cause small changes. The only proper
>>> way to get true stability is to run a color target periodically, and
>>> rebuild your profile. That implies that you should be applying the
>>> profile as you scan, or storing the scan of the color target serially
>>> with your normal scans for later processing.
>> Storing the scan of the color target as I scan is an interesting idea.
>>  Could the same thing be done with a "white marks" target to later
>> move pixels to eliminate artifacts?
> Yes- though checking the manual for a calibration procedure would be easier :)
> allan

I've checked the manual, searched the unit's front panel, Googled, and
called Epson but there doesn't seem to be a calibration procedure.
Can you point me in the right direction with a white marks target

- Grant

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