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<TITLE>sane-devel: Re: 3091 backend: Brightness, Contrast etc.</TITLE>
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<META NAME="Author" CONTENT="Ulrich Deiters (ukd@xenon.pc.Uni-Koeln.DE)">
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<META NAME="Subject" CONTENT="Re: 3091 backend: Brightness, Contrast etc.">
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<H1>Re: 3091 backend: Brightness, Contrast etc.</H1>
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<!-- received="Wed Mar 7 23:13:07 2001" -->
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<!-- name="Ulrich Deiters" -->
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<!-- subject="Re: 3091 backend: Brightness, Contrast etc." -->
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<STRONG>From:</STRONG> Ulrich Deiters (<A HREF="mailto:ukd@xenon.pc.Uni-Koeln.DE?Subject=Re:%203091%20backend:%20Brightness,%20Contrast%20etc.&In-Reply-To=<200103080732.IAA11685@xenon.pc.Uni-Koeln.DE>"><EM>ukd@xenon.pc.Uni-Koeln.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Mar 07 2001 - 23:32:48 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0113.html">Marian Eichholz: "Re: 3091 backend: Brightness, Contrast etc."</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0111.html">John Pitney: "Re: HP PhotoSmart problem"</A>
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<LI><STRONG>Maybe in reply to:</STRONG> <A HREF="0107.html">Frederik Ramm: "3091 backend: Brightness, Contrast etc."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0114.html">Frederik Ramm: "Re: 3091 backend: Brightness, Contrast etc."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0113.html">Marian Eichholz: "Re: 3091 backend: Brightness, Contrast etc."</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0114.html">Frederik Ramm: "Re: 3091 backend: Brightness, Contrast etc."</A>
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... very interesting! My Canon FS 2710 does not seem to be able to
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<BR>
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set brightness, contrast, etc., too; perhaps it is a new fashion
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<BR>
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not to have these controls?
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<BR>
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<P>If you have to do a minor adjustment of contrast, gamma, hue, etc.,
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<BR>
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doing it with the frontend or with a graphics editor program after
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<BR>
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scanning is OK and probably even more comfortable. But if you want
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<BR>
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to do a major correction, like brightening an underexposed photo,
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<BR>
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you will see colour fringes: Whereever the density curve is very
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<BR>
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steep, only very few input values are mapped to a wide range of
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<BR>
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output values. If the scanner is well designed, storing the density
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<BR>
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curve in the scanner eliminates this problem.
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<BR>
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<P>Regards,
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<BR>
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<P>Ulrich Deiters
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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:%203091%20backend:%20Brightness,%20Contrast%20etc.&In-Reply-To=<200103080732.IAA11685@xenon.pc.Uni-Koeln.DE>">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="0113.html">Marian Eichholz: "Re: 3091 backend: Brightness, Contrast etc."</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0111.html">John Pitney: "Re: HP PhotoSmart problem"</A>
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<LI><STRONG>Maybe in reply to:</STRONG> <A HREF="0107.html">Frederik Ramm: "3091 backend: Brightness, Contrast etc."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0114.html">Frederik Ramm: "Re: 3091 backend: Brightness, Contrast etc."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0113.html">Marian Eichholz: "Re: 3091 backend: Brightness, Contrast etc."</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0114.html">Frederik Ramm: "Re: 3091 backend: Brightness, Contrast etc."</A>
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