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<TITLE>sane-devel: Re: Scan ahead</TITLE>
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<META NAME="Author" CONTENT="Peter Kirchgessner (peter@kirchgessner.net)">
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<META NAME="Subject" CONTENT="Re: Scan ahead">
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<H1>Re: Scan ahead</H1>
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<!-- received="Fri Mar 30 11:57:38 2001" -->
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<!-- isoreceived="20010330195738" -->
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<!-- sent="Fri, 30 Mar 2001 22:09:01 +0200" -->
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<!-- isosent="20010330200901" -->
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<!-- name="Peter Kirchgessner" -->
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<!-- email="peter@kirchgessner.net" -->
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<!-- subject="Re: Scan ahead" -->
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<!-- id="3AC4E7DD.2A4F69C7@kirchgessner.net" -->
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<!-- inreplyto="2F9F0A691323D5449926C19BEFF988C30A44FD@services2k.jflinc.com" -->
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<STRONG>From:</STRONG> Peter Kirchgessner (<A HREF="mailto:peter@kirchgessner.net?Subject=Re:%20Scan%20ahead&In-Reply-To=<3AC4E7DD.2A4F69C7@kirchgessner.net>"><EM>peter@kirchgessner.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Mar 30 2001 - 12:09:01 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0251.html">JFL Sane Dev: "RE: Scan ahead"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0249.html">JFL Sane Dev: "Scan ahead"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0252.html">Stephen Williams: "Re: Scan ahead"</A>
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<P>
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Hello Marius,
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<BR>
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<P>I dont know a scanner that can store a single frame completely. For an
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<BR>
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A4 scan at 600 dpi with 24bit you would need about 100MB of memory.
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<BR>
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Maybe this works for b/w scans at low resolution. But in that case I
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<BR>
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suppose the scanner will not accept to start a new scan when the image
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<BR>
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has not been read completely.
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<BR>
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<P>Sincerely
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<BR>
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<P>Peter
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<BR>
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<P><EM>> JFL Sane Dev wrote:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Hi,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I am a beginner with SANE. Could anyone tell me please how should a
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</EM><BR>
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<EM>> scan-ahead (automatic scan, the scanner scans asynchronously at
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</EM><BR>
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<EM>> highest possible speed to its internal memory buffer, the driver reads
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</EM><BR>
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<EM>> images at its own speed from the scanner buffer) image acquisition
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</EM><BR>
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<EM>> sequence be implemented in a SANE session?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> If the driver starts the scanner in automatic mode at first sane_start
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</EM><BR>
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<EM>> it receives, would the application have to not request sane_cancel
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</EM><BR>
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<EM>> until all images are transferred?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> If the application would call repeatedly sane_start +
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</EM><BR>
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<EM>> sane_read_until_SANE_STATUS_EOF for each image, and then call
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</EM><BR>
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<EM>> sane_cancel when sane_start (or sane_read) returns
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</EM><BR>
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<EM>> SANE_STATUS_NO_DOCS? Would this be the correct procedure?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Thanks,
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</EM><BR>
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<EM>> Marius Niculescu
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</EM><BR>
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<P><PRE>
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--
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Peter Kirchgessner
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<A HREF="http://www.kirchgessner.net">http://www.kirchgessner.net</A>
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mailto:<A HREF="mailto:peter@kirchgessner.net?Subject=Re:%20Scan%20ahead&In-Reply-To=<3AC4E7DD.2A4F69C7@kirchgessner.net>">peter@kirchgessner.net</A>
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<P><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:%20Scan%20ahead&In-Reply-To=<3AC4E7DD.2A4F69C7@kirchgessner.net>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Reply:</STRONG> <A HREF="0252.html">Stephen Williams: "Re: Scan ahead"</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 Mar 30 2001 - 11:58:10 PST</EM>
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