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<TITLE>sane-devel: Re: How to configure xsane I/P device? (xsane v4l i</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@Wolfsburg.DE)">
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<META NAME="Subject" CONTENT="Re: How to configure xsane I/P device? (xsane v4l interface)">
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<H1>Re: How to configure xsane I/P device? (xsane v4l interface)</H1>
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<!-- received="Thu Sep 21 07:13:07 2000" -->
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<!-- subject="Re: How to configure xsane I/P device? (xsane v4l interface)" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@Wolfsburg.DE?Subject=Re:%20How%20to%20configure%20xsane%20I/P%20device?%20(xsane%20v4l%20interface)&In-Reply-To=<39CA186D.97F6F74@wolfsburg.de>"><EM>oliver.rauch@Wolfsburg.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Sep 21 2000 - 07:17:17 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0208.html">Oliver Rauch: "Re: Which scanner to buy?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0206.html">Wolfgang Cohrs: "sane on SPARC SOLARIS 8"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0198.html">Lawrence Glaister: "How to configure xsane I/P device? (xsane v4l interface)"</A>
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Lawrence Glaister wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> I am using xsane 0.61 with 1.01/1.02/1.03 versions of sane.
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</EM><BR>
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<EM>> I have a web cam (Creative Labs webcam 3 USB) on one usb port and usb
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</EM><BR>
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<EM>> scanner (Agfa 1212u) on the other port.
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</EM><BR>
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<EM>> xscanimage correctly sees both devices and allows me to chose the input
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</EM><BR>
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<EM>> device.
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</EM><BR>
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<EM>> How do I get xsane to use the scanner instead of the webcam?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> - A second problem with xsane and the webcam is that yellow areas of the
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</EM><BR>
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<EM>> picture show up as blue. I suspect that xsane is expecting an rgb image, but
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</EM><BR>
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<EM>> most webcams return a bgr or is it gbr? It may be useful to add a v4l
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</EM><BR>
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<EM>> interface config that allows swapping the rgb components.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> - A third problem with the xsane v4l interface, is that it appears to be
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</EM><BR>
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<EM>> using the wrong buffer for pulling its data.... ie, the first preview gives
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</EM><BR>
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<EM>> a blank image (black) and the second attempt gives a correct image... this
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</EM><BR>
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<EM>> continues... the preview data is always 1 picture behind the last picture
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</EM><BR>
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<EM>> taken from the camera. I know the ov511 camera driver has 2 image buffers
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</EM><BR>
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<EM>> and toggles between them. This can probably be fixed with a v4l sync call.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>Hi Lawrence,
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<BR>
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<P>- there is no xsane v4l interface, may be you wanted to say sane v4l interface
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<BR>
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- xsane is known not to work fine with v4l, I think xscanimage does not
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<BR>
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work much better. This are problems of the v4l backend.
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<BR>
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- There are several ways to make xsane start with your scanner backend:
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<BR>
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1) for xsane-0.61:
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<BR>
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export SANE_DEFAULT_DEVICE=snapscan
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<BR>
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2) if you do not use the v4l backend, set a comment in dll.conf before v4l
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<BR>
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3) call "xsane snapscan" or set an alias
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<BR>
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<P>Bye
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<BR>
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Oliver
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<BR>
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<BR>
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<P><P><PRE>
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--
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Homepage: <A HREF="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</A>
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sane-umax: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-umax.html">http://www.wolfsburg.de/~rauch/sane/sane-umax.html</A>
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xsane: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-xsane.html">http://www.wolfsburg.de/~rauch/sane/sane-xsane.html</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@Wolfsburg.DE?Subject=Re:%20How%20to%20configure%20xsane%20I/P%20device?%20(xsane%20v4l%20interface)&In-Reply-To=<39CA186D.97F6F74@wolfsburg.de>">Oliver.Rauch@Wolfsburg.DE</A>
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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:%20How%20to%20configure%20xsane%20I/P%20device?%20(xsane%20v4l%20interface)&In-Reply-To=<39CA186D.97F6F74@wolfsburg.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0208.html">Oliver Rauch: "Re: Which scanner to buy?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0206.html">Wolfgang Cohrs: "sane on SPARC SOLARIS 8"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0198.html">Lawrence Glaister: "How to configure xsane I/P device? (xsane v4l interface)"</A>
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: <EM>Thu Sep 21 2000 - 07:14:30 PDT</EM>
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