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<TITLE>sane-devel: Some snapscan feedback</TITLE>
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<META NAME="Author" CONTENT="Steffen Kluge (kluge@fujitsu.com.au)">
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<META NAME="Subject" CONTENT="Some snapscan feedback">
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<H1>Some snapscan feedback</H1>
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<!-- received="Fri May 26 08:05:10 2000" -->
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<!-- name="Steffen Kluge" -->
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<!-- email="kluge@fujitsu.com.au" -->
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<!-- subject="Some snapscan feedback" -->
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<!-- id="20000527010845.A6489@syd0128.fujitsu.com.au" -->
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<STRONG>From:</STRONG> Steffen Kluge (<A HREF="mailto:kluge@fujitsu.com.au?Subject=Re:%20Some%20snapscan%20feedback&In-Reply-To=<20000527010845.A6489@syd0128.fujitsu.com.au>"><EM>kluge@fujitsu.com.au</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri May 26 2000 - 08:08:45 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0177.html">Peter Kirchgessner: "Re: Sane HP backend coredumps"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0175.html">Russ Burdick: "Re: Acer Prisa 620P"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0180.html">Douglas Gilbert: "Re: Some snapscan feedback"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0180.html">Douglas Gilbert: "Re: Some snapscan feedback"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0183.html">Steve Underwood: "Re: Some snapscan feedback"</A>
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<HR NOSHADE><P>
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<P>
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Hi,
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<BR>
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I've been playing a bit with my Acer Prisa 620ST and the new
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<BR>
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snapscan backend. This is what I found:
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<BR>
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<P>- The problems I reported earlier on this list with warped
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<BR>
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system timers (making screensavers and DPMS kick in and wreak
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<BR>
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havoc among some GUI clocks) have disappeared when I stopped
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<BR>
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using the AHA1542B host adapter. I believe they were to blame on
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<BR>
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either the adapter or the driver but not on sane, the snapscan
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<BR>
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backend or the sg driver. I'm using a Tekram DC315U now.
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<BR>
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<P>- Steve's new snapscan backend (snapscan-20000514) does a
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<BR>
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remarkable job, the transparency unit works well and the three
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<BR>
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channels are aligned perfectly without post-processing.
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<BR>
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<P>- I'm having problems with the preview scan when using xsane.
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<BR>
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The scanner stops after about 30% and proceeds very slowly
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<BR>
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(like one line at a time every now and then). After a minute
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<BR>
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or two it goes on as normal until it reaches about 90%, then
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<BR>
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stops again and eventually finishes. Sometimes it pauses
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<BR>
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longer sometimes shorter. Sometimes switching desktops (in
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<BR>
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enlightenment) or randomly clicking mouse buttons helps. This
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<BR>
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behaviour can't be changed through any of the settings in the
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<BR>
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xsane dialog boxes, as long as the preview mode is colour
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<BR>
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(doesn't happen in bi-level, line-art or gray scale). A gdb
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<BR>
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run of xsane shows that it sits on a select, like in this bt:
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<BR>
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<P> #0 0x4039854e in __select () from /lib/libc.so.6
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<BR>
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#1 0x404584f8 in __DTOR_END__ ()
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<BR>
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from /usr/local/lib/sane/libsane-snapscan.so.1
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<BR>
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#2 0x4045316a in sanei_scsi_cmd (fd=32, src=0x80eaef8, src_size=10,
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<BR>
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dst=0x80eaff8, dst_size=0x80f2c00) at sanei_scsi.c:2065
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<BR>
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#3 0x40446d6e in scsi_read (pss=0x80eaec0, read_type=0 '\000')
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<BR>
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at snapscan-scsi.c:785
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<BR>
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#4 0x404475b2 in SCSISource_get (pself=0x837e248,
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<BR>
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pbuf=0x839f10d "\021", '\f' <repeats 54 times>, plen=0xbfffcc5c)
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<BR>
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at snapscan-sources.c:158
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<BR>
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#5 0x40447fbc in TxSource_get (pself=0x839eac8,
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<BR>
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pbuf=0x839f10d "\021", '\f' <repeats 54 times>, plen=0xbfffcc5c)
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<BR>
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at snapscan-sources.c:439
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<BR>
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#6 0x40448943 in RGBRouter_get (pself=0x839eac8,
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<BR>
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pbuf=0xbfffe224 "\f\021\f\f\021\f\f\021\f\f\021\f\f\021", plen=0xbfffcd24)
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<BR>
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at snapscan-sources.c:688
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<BR>
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#7 0x4044fac8 in sane_snapscan_read (h=0x80eaec0, buf=0xbfffcd30 "",
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<BR>
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maxlen=8192, plen=0xbfffcd24) at snapscan.c:2508
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<BR>
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#8 0x402bad7f in sane_dll_read (handle=0x80f3078, data=0xbfffcd30 "",
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<BR>
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max_length=8192, length=0xbfffcd24) at dll.c:837
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<BR>
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#9 0x402bb09d in sane_read (h=0x80f3078, buf=0xbfffcd30 "", maxlen=8192,
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<BR>
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lenp=0xbfffcd24) at dll-s.c:52
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<BR>
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#10 0x805bb93 in preview_read_image_data (data=0x817b528, source=-1,
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<BR>
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cond=GDK_INPUT_READ) at xsane-preview.c:840
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<BR>
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<P> The funny thing is that xscanimage's preview doesn't ever show
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<BR>
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this behaviour. I really like xsane's preview better, though
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<BR>
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(zoom etc). I've been testing with xsane version 0.57 and
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<BR>
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0.59, both versions behave this way. I also recompiled sane
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<BR>
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and xsane with no optimisations (I thought that might be a
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<BR>
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good idea since I'm using an Athlon), but it made no
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<BR>
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difference.
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<BR>
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<P>- I can't for the heck of it scan at resolutions higher than
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<BR>
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600dpi, although the scanner supports up to 19200dpi. The
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<BR>
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program (scanimage, xscanimage or xsane) just freezes (enters
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<BR>
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an endless loop) in function measure_transfer_rate. I can
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<BR>
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follow the loop in the debugger but I don't understand the
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<BR>
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program logic so I can't say what's going wrong. I believe
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<BR>
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(but am not sure) that I could use higher resolutions with
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<BR>
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previous versions of the backend.
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<BR>
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<P>- I'm doing all this with sane-1.0.2, kernel-2.2.14, sg-3.0.15,
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<BR>
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and the host adapter/scanner look like this:
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<BR>
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<P> scsi0 : Tekram DC395U/UW/F DC315/U V1.10, 1999/07/19
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<BR>
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scsi : 1 host.
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<BR>
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Vendor: Color Model: FlatbedScanner_9 Rev: 0117
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<BR>
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Type: Scanner ANSI SCSI revision: 02
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<BR>
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Detected scsi generic sg0 at scsi0, channel 0, id 2, lun 0, type 6
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<BR>
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<P>All in all I'm quite happy with the pace of progress so far. If
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<BR>
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it goes on like this the scanner will be ready for prime time
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<BR>
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soon :-) Time to acquire some GIMP photo editing skills...
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<BR>
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<P>Cheers
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<BR>
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Steffen.
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<BR>
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<P><PRE>
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--
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Steffen Kluge <<A HREF="mailto:kluge@fujitsu.com.au?Subject=Re:%20Some%20snapscan%20feedback&In-Reply-To=<20000527010845.A6489@syd0128.fujitsu.com.au>">kluge@fujitsu.com.au</A>>
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Fujitsu Australia Ltd
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Keywords: photography, Mozart, UNIX, Islay Malt, dark skies
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--
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<P>--
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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:%20Some%20snapscan%20feedback&In-Reply-To=<20000527010845.A6489@syd0128.fujitsu.com.au>">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="0177.html">Peter Kirchgessner: "Re: Sane HP backend coredumps"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0175.html">Russ Burdick: "Re: Acer Prisa 620P"</A>
|
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0180.html">Douglas Gilbert: "Re: Some snapscan feedback"</A>
|
|
<LI><STRONG>Reply:</STRONG> <A HREF="0180.html">Douglas Gilbert: "Re: Some snapscan feedback"</A>
|
|
<LI><STRONG>Reply:</STRONG> <A HREF="0183.html">Steve Underwood: "Re: Some snapscan feedback"</A>
|
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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>Fri May 26 2000 - 08:07:20 PDT</EM>
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