Re: snapscan vs. acer 310S

From: Jouke Hylkema (Jouke.Hylkema@cert.fr)
Date: Tue Jun 13 2000 - 01:34:40 PDT

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    On 10 Jun, Russ Burdick wrote:
    >
    > ok, i've finally got a bit of time to play with my scanner again and i've
    > been doing some work with my Acer Prisma 310S and the latest snapscan
    > backend (snapscan-20000514.tar.gz) and sane-1.0.2.
    >
    > from what i've gone through in the source it seem that this scanner has
    > the same id (and supposedly behavior) as the VUEGO310S. this brings me to
    > my first question for the list: is there anyone out there using a Vuego
    > 310S that has had success with any version of sane+snapscan? if the vuego
    > works and the acer doesnt, perhaps they're not the same inside and it'd be
    > worthwhile to start thinking about separating the two in the snapscan
    > code.
    >
    > back when kevin was still taking care of snapscan and active on this list
    > i had a few conversations with him about trying to get snapscan working
    > correctly for the acer 310S. at present everything but the very begining
    > of a scan is complete garbage, so he had me try doing small scans,
    > specifically < 64K. you can see some example of the output here:
    >
    > http://www.cs.umn.edu/~wburdick/sane/
    >
    > the first two are color at different resolutions and the last three are
    > greyscale. the final image is of a slightly different area on my test
    > image since the top of the first one didnt seem all that interesting. this
    > is the one i find most interesting. it looks like the first 'block' is
    > clear, then the subsequent 'blocks' get more and more garbled. i should
    > also note that the resulting pnms (produced by xscanimage) 'appeared to be
    > truncated' according to xv, but the greyscale images were fine. i used xv
    > to check the images out and to convert them to the above referenced
    > pngs. i did all of the above after 'export SANE_DEUBUG_SNAPSCAN=128' and
    > the resulting output is also at the above referenced url.
    >
    > i thought before jumping into the code too deep i'd see if anyone had any
    > thoughts on what i'm seeing. is there something it's doing different on
    > the scans after the first one that it shouldnt be? any comments welcome.
    >
    > Russ
    >

    I have exactely the same problem with my vuego 310s, I haven't tried the
    latest backend yet but I will as soon as I have a litle spare time.
    Please keep me posted.

    Jouke

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