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<TITLE>sane-devel: Re: [linux-usb-devel] "Rainbow" striping</TITLE>
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<META NAME="Author" CONTENT="Scott Gifford (sgifford@tir.com)">
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<META NAME="Subject" CONTENT="Re: [linux-usb-devel] "Rainbow" striping on USB HP ScanJet 5300C">
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<H1>Re: [linux-usb-devel] "Rainbow" striping on USB HP ScanJet 5300C</H1>
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<!-- sent="27 Dec 2000 12:44:57 -0500" -->
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<!-- name="Scott Gifford" -->
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<!-- subject="Re: [linux-usb-devel] "Rainbow" striping on USB HP ScanJet 5300C" -->
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<!-- id="m38zp1iwrq.fsf@sghome.tir.com" -->
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<!-- inreplyto="Tue, 26 Dec 2000 23:44:59 -0500 (EST)"" -->
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<STRONG>From:</STRONG> Scott Gifford (<A HREF="mailto:sgifford@tir.com?Subject=Re:%20[linux-usb-devel]%20"Rainbow"%20striping%20on%20USB%20HP%20ScanJet%205300C&In-Reply-To=<m38zp1iwrq.fsf@sghome.tir.com>"><EM>sgifford@tir.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Dec 27 2000 - 09:44:57 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0285.html">Per Aalrust: "Epson Perfection 1200 Photo USB crashes"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0283.html">Mark Stewart: "Re: Umax 600s/Adaptec 2906 trouble"</A>
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<A HREF="mailto:jhall@UU.NET?Subject=Re:%20[linux-usb-devel]%20"Rainbow"%20striping%20on%20USB%20HP%20ScanJet%205300C&In-Reply-To=<m38zp1iwrq.fsf@sghome.tir.com>">jhall@UU.NET</A> (Jeremy Hall) writes:
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<BR>
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<P><EM>> WAY KULE!
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I haven't tried my driver with super-recent kernel, I'm still running
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</EM><BR>
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<EM>> test8. What version of sane are you running?
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</EM><BR>
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<P>1.0.3
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<BR>
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<P><EM>>
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</EM><BR>
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<EM>> Since I am a visually impaired person, perhaps the stripes don't interfeer
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</EM><BR>
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<EM>> with OcR.
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</EM><BR>
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<P>I would think they would; when I print out a scanned image with the
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<BR>
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stripes, about every 10th letter is completely illegible.
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<BR>
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<P><EM>> I could scan a page with my scanner and provide the image for your
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</EM><BR>
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<EM>> examination.
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</EM><BR>
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<P>Sure. Feel free to email an image to me, or put it somewhere
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<BR>
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publicly accessible, and I'll see if it looks at all similar to what
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<BR>
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I'm seeing.
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<BR>
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<P><EM>> Is this in colour or gray?
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</EM><BR>
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<P>I see the strips both when scanning in color, greyscale, or line-art
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<BR>
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mode. Of course, they're grey or black-and-white in the other modes.
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<BR>
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<P><EM>> I have noticed that the scanner behaves quite differently when
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</EM><BR>
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<EM>> trying to scan at say 600dpi instead of 300dpi, sane's defaults try
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</EM><BR>
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<EM>> to produce a horridly LARGE image, trying to produce a 24-bit colour
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</EM><BR>
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<EM>> image.
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</EM><BR>
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<P>I'll play with that some more; I tried different resolutions, but
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<BR>
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mostly tested with the defaults.
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<BR>
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<P><EM>>
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</EM><BR>
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<EM>> I've been mostly scanning gray 300dpi images for OCR purposes.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I have considered the possibility that scsi errors may not be getting back
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</EM><BR>
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<EM>> to the scsi handler, but I find this difficult to understand why since the
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</EM><BR>
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<EM>> code seems to read correctly. Have you tried running with an USB analyzer
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</EM><BR>
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<EM>> both in Linux and Windoze to determine if they chat differently?
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</EM><BR>
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<P>I have not tried that; this is the first time I've ever tried to use a
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<BR>
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USB device. I'll try to find a good analyzer and see if I can make
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<BR>
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any headway with it.
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<BR>
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<P><EM>> Basically what happens is the following sequence:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> We send a command to the OUT endpoint. We may then retrieve data or the
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</EM><BR>
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<EM>> status handler may be called. Depending on the results of the status
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</EM><BR>
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<EM>> handler, we may or may not send back an error to the scsi layer.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> There may be some race conditions not yet realized, this is why testing is
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</EM><BR>
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<EM>> suggested.
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</EM><BR>
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<P>Thanks for your help!
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<BR>
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<P>-----ScottG.
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<BR>
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<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:%20[linux-usb-devel]%20"Rainbow"%20striping%20on%20USB%20HP%20ScanJet%205300C&In-Reply-To=<m38zp1iwrq.fsf@sghome.tir.com>">majordomo@mostang.com</A>
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</PRE>
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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>Wed Dec 27 2000 - 09:31:03 PST</EM>
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