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<TITLE>sane-devel: Re: snapscan vs. acer 310S</TITLE>
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<META NAME="Author" CONTENT="Steve Underwood (steveu@coppice.org)">
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<META NAME="Subject" CONTENT="Re: snapscan vs. acer 310S">
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<H1>Re: snapscan vs. acer 310S</H1>
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<!-- received="Sun Jun 11 04:32:30 2000" -->
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<!-- sent="Sun, 11 Jun 2000 19:33:59 +0800" -->
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<!-- name="Steve Underwood" -->
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<!-- subject="Re: snapscan vs. acer 310S" -->
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<!-- id="39437927.2C73ABB3@coppice.org" -->
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<!-- inreplyto="Pine.LNX.4.21.0006101014300.3743-100000@whitestar" -->
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<STRONG>From:</STRONG> Steve Underwood (<A HREF="mailto:steveu@coppice.org?Subject=Re:%20snapscan%20vs.%20acer%20310S&In-Reply-To=<39437927.2C73ABB3@coppice.org>"><EM>steveu@coppice.org</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Jun 11 2000 - 04:33:59 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0094.html">abel deuring: "Re: Problems with sane-scsi"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0092.html">Simon Edwards: "Re: Acer 620ST update"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0090.html">Russ Burdick: "snapscan vs. acer 310S"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0096.html">Russ Burdick: "Re: snapscan vs. acer 310S"</A>
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<P>
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Russ Burdick wrote:
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<BR>
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<P><EM>> ok, i've finally got a bit of time to play with my scanner again and i've
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</EM><BR>
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<EM>> been doing some work with my Acer Prisma 310S and the latest snapscan
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</EM><BR>
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<EM>> backend (snapscan-20000514.tar.gz) and sane-1.0.2.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> from what i've gone through in the source it seem that this scanner has
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</EM><BR>
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<EM>> the same id (and supposedly behavior) as the VUEGO310S. this brings me to
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</EM><BR>
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<EM>> my first question for the list: is there anyone out there using a Vuego
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</EM><BR>
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<EM>> 310S that has had success with any version of sane+snapscan? if the vuego
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</EM><BR>
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<EM>> works and the acer doesnt, perhaps they're not the same inside and it'd be
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</EM><BR>
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<EM>> worthwhile to start thinking about separating the two in the snapscan
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</EM><BR>
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<EM>> code.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> back when kevin was still taking care of snapscan and active on this list
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</EM><BR>
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<EM>> i had a few conversations with him about trying to get snapscan working
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</EM><BR>
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<EM>> correctly for the acer 310S. at present everything but the very begining
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</EM><BR>
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<EM>> of a scan is complete garbage, so he had me try doing small scans,
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</EM><BR>
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<EM>> specifically < 64K. you can see some example of the output here:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> <A HREF="http://www.cs.umn.edu/~wburdick/sane/">http://www.cs.umn.edu/~wburdick/sane/</A>
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> the first two are color at different resolutions and the last three are
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</EM><BR>
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<EM>> greyscale. the final image is of a slightly different area on my test
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</EM><BR>
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<EM>> image since the top of the first one didnt seem all that interesting. this
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</EM><BR>
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<EM>> is the one i find most interesting. it looks like the first 'block' is
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</EM><BR>
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<EM>> clear, then the subsequent 'blocks' get more and more garbled. i should
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</EM><BR>
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<EM>> also note that the resulting pnms (produced by xscanimage) 'appeared to be
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</EM><BR>
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<EM>> truncated' according to xv, but the greyscale images were fine. i used xv
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</EM><BR>
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<EM>> to check the images out and to convert them to the above referenced
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</EM><BR>
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<EM>> pngs. i did all of the above after 'export SANE_DEUBUG_SNAPSCAN=128' and
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</EM><BR>
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<EM>> the resulting output is also at the above referenced url.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> i thought before jumping into the code too deep i'd see if anyone had any
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</EM><BR>
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<EM>> thoughts on what i'm seeing. is there something it's doing different on
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</EM><BR>
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<EM>> the scans after the first one that it shouldnt be? any comments welcome.
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</EM><BR>
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<P>If you still have the box your scanner came in, look at it. It says "Acer
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<BR>
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Vuego 310S", in big letters. There is only one model 310S, but somehow in the
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<BR>
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history of the snapscan driver it has been confused as being 2 fairly similar
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<BR>
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machines.
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<BR>
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<P>The oddness of your scan is, in itself, odd. At first I thought something odd
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<BR>
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happens every 8192 bytes. That idea fits some of your pictures. It doesn't
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<BR>
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seem to fit out2.png, though. The dirty blue changes to dirty green over a
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<BR>
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substantial block of lines. That doesn't seem to fit the model of a simple
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<BR>
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hiccup in the data stream, even allowing for the chroma offsets, which the
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<BR>
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latest driver compensates for.
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<BR>
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<P>A couple of questions. What OS and version are you using? I tested the latest
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<BR>
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driver with a RedHat 6.2 installation. That has the recently updated generic
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<BR>
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SCSI driver, which may be a factor. At what resolution were these scans
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<BR>
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performed? It makes a difference when trying to allow for the chroma offset
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<BR>
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compensation analysing your weird results.
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<BR>
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<P>One thing worth trying - in snapscan.c you will find a bit that goes:
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<BR>
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<P> if (pss->pdev->model == PRISA620S /* GP added - blocking mode only */
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<BR>
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||
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<BR>
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pss->pdev->model == VUEGO610S) /* SJU added */
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<BR>
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{
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<BR>
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status = SANE_STATUS_UNSUPPORTED;
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<BR>
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}
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<BR>
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else if (pipe (pss->rpipe) != -1)
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<BR>
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{
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<BR>
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<P>Change it to go:
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<BR>
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<P> if (pss->pdev->model == PRISA620S
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<BR>
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||
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<BR>
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pss->pdev->model == VUEGO310S
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<BR>
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||
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<BR>
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pss->pdev->model == VUEGO610S)
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<BR>
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{
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<BR>
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status = SANE_STATUS_UNSUPPORTED;
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<BR>
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}
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<BR>
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else if (pipe (pss->rpipe) != -1)
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<BR>
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{
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<BR>
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<P>and see what happens.
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<BR>
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<P>Steve
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<BR>
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<P><P><P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20snapscan%20vs.%20acer%20310S&In-Reply-To=<39437927.2C73ABB3@coppice.org>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0094.html">abel deuring: "Re: Problems with sane-scsi"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0092.html">Simon Edwards: "Re: Acer 620ST update"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0090.html">Russ Burdick: "snapscan vs. acer 310S"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0096.html">Russ Burdick: "Re: snapscan vs. acer 310S"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0096.html">Russ Burdick: "Re: snapscan vs. acer 310S"</A>
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<SMALL>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun Jun 11 2000 - 04:35:26 PDT</EM>
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