[sane-devel] Mustek P1200 A3 Pro y-axis geometry maximum 424mm->429mm

[Al Savage]

I have a pair of Paragon 1200 A3 Pro SCSI scanners, which are
large-format.

Under WinXP, the Mustek-supplied TWAIN dialog shows a maximum y-axis
(length) of 429mm (or 16.9").  Screenshots for metric and imperial:

http://asavage.dyndns.org/ftp/hosting/SANE/TWAIN_01b.jpg
http://asavage.dyndns.org/ftp/hosting/SANE/TWAIN_02b.jpg

I have tested this (I placed a yardstick on the bed and scanned it)
and it does scan very close to 429mm.

The Mustek 1.0-138 backend included in 1.0.23 backends limits the
y-axis to 424mm.  I have recently found that I need that extra 5mm ;)

There is a note in mustek.CHANGES:

2004-06-08
  * Released Mustek backend 1.0-137
  * Reduced scan area of Mustek Paragon 1200 A3 Pro.
    Removed warning message.
    Increased support level to complete.

I assume that there was a good reason to do this, but I do not know
what it was.

[ Henning Meier-Geinitz kindly added the --lamp-off --dont-scan
options for me for the release after that one, and I use them quite a
bit, so using a backlevel backend is not a good option here. ]

a) Can the reason for reducing the scan area for this model be found? 
Regardless:

b) Is it possible & reasonable to allow y-axis of 429.23mm for this
model?

The relevant line in mustek.c is #1562 :

      dev->y_range.max = SANE_FIX (424);

I'd like to try that with a value of 430.
I'm unable to compile this myself, as I do not have a setup that will
let me do this. I'm willing to be the tester.

-- 
Regards,                 Duvall, Wash.
Al S.                    http://nissandiesel.dyndns.org