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<TITLE>sane-devel: Re: Agfa StudioScan IIsi [long]</TITLE>
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<META NAME="Author" CONTENT="Matto Marjanovic (maddog@mir.com)">
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<META NAME="Subject" CONTENT="Re: Agfa StudioScan IIsi [long]">
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<H1>Re: Agfa StudioScan IIsi [long]</H1>
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<!-- received="Mon May 21 07:12:16 2001" -->
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<!-- sent="Mon, 21 May 2001 10:11:58 -0400" -->
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<!-- name="Matto Marjanovic" -->
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<!-- subject="Re: Agfa StudioScan IIsi [long]" -->
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<!-- inreplyto="04d901c0e1de$2e73bc60$cf01020a@perfectdomain.perfectimage.co.uk" -->
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<STRONG>From:</STRONG> Matto Marjanovic (<A HREF="mailto:maddog@mir.com?Subject=Re:%20Agfa%20StudioScan%20IIsi%20%20%20%20%20[long]&In-Reply-To=<E151qPe-0007fm-00@yoo-hoo.ai.mit.edu>"><EM>maddog@mir.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon May 21 2001 - 07:11:58 PDT
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<P>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0266.html">Jet Set Willy: "Re: Agfa StudioScan IIsi [long]"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0269.html">Jet Set Willy: "Re: Agfa StudioScan IIsi [long]"</A>
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<P>
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Try this: uncomment both "norealcal" and "noprecal", and then send me the
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<BR>
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resulting debug log, of a color scan.
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<BR>
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(Make sure you get a little sleep first! :)
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<BR>
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<P><P>The two are misnomers (which I intend to change this week), so here is a bit
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<BR>
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of explanation:
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<BR>
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<P> o By default, the scanner firmware performs some little automatic calibration
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<BR>
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at the start of every scan. This takes a few seconds.
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<BR>
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o There is an inquiry bit which indicates whether or not this calibration
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<BR>
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can be disabled.
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<BR>
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o The Scanmaker E6, and maybe others, has an additional calibration feature
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<BR>
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which has its own SCSI command. This I call "real calibration", because
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<BR>
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it actually involves the backend performing calculations on data returned
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<BR>
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by the scanner.
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<BR>
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<P> and
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<BR>
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<P> o The backend tries to be clever, by only allowing the calibration once per
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<BR>
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session (which shaves time off of all your scans).
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<BR>
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<P>So, the (purposely flawed) logic is as follows:
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<BR>
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<P> o If calibration can be disabled and not (norealcal),
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<BR>
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use the 'real calibration' routine.
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<BR>
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o Else, if calibration can be disabled and not (noprecal),
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<BR>
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use a clever trick which does a microscan once with default calibration,
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<BR>
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and then disables it for the rest of the session.
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<BR>
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o Else, do not use 'real calibration', and don't disable default calibration.
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<BR>
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<P>Actually, in v0.12.1 of the backend, I quickly changed the behavior to
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<BR>
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act like "norealcal | noprecal" for everything but the E6, just because
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<BR>
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of the volume of complaints. (I originally wanted to see which scanners
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<BR>
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used the 'realcal', so I made it the default and waited for the bug reports
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<BR>
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to come in. That was a mistake.)
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<BR>
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<P>-matt m.
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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:%20Agfa%20StudioScan%20IIsi%20%20%20%20%20[long]&In-Reply-To=<E151qPe-0007fm-00@yoo-hoo.ai.mit.edu>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0268.html">Bjoern Brill: "Re: how to write a manpage"</A>
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