[sane-devel] Q: improving epson2 for Epson 12000XL

Olaf Meeuwissen paddy-hack at member.fsf.org
Tue Sep 29 10:15:09 BST 2020

Hi Wolfram,

Wolfram Sang writes:

> Hi Olaf,
>> Actually, I've found a reference in my dead tree specs that all other
>> values with the one byte limit are supported.  0x00 through 0x39 are
>> below the glass plate, 0x41 through 0xfe are above.  Units unknown but
>> based on your observation of 0x59 being 25 steps away from 0x40 and it
>> corresponding to 2.5mm, I'd hazard a guess its 0.1mm assuming a linear
>> ramp.
> That is my assumption as well. But please note that the 0x59 value comes
> from Alessandro Zummo and was already existing in the epson2 driver.

I think you mean the epson backend.  The 0x40 and 0x59 values trace back
to commit 64e36892a1, made on 2001-11-10.

> I did not verify it yet because I was only scannning on glass. We
> might need a custom value later in case we build some frame, too, to
> avoid glass on glass contact. We will see.

Looking forward to your findings,
Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
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