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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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<STRONG>From:</STRONG> Ulrich Deiters (<A HREF="mailto:ukd@xenon.pc.Uni-Koeln.DE?Subject=Re:%203091%20backend:%20Brightness,%20Contrast%20etc.&In-Reply-To=<200103081107.MAA12170@xenon.pc.Uni-Koeln.DE>"><EM>ukd@xenon.pc.Uni-Koeln.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Mar 08 2001 - 03:07:34 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0117.html">Frederik Ramm: "Have a "scan" button? Read this..."</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0115.html">AkkiSan@t-online.de: "Any news on Mustek USB?"</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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I must admit that I am not familiar with the internals of the light-receiving
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<BR>
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part of a modern scanner. In principle there has to be an analogue/digital
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<BR>
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converter somewhere, and in principle such a device can or should have
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<BR>
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adjustable zero setting and sensitivity. Hence it makes sense to transmit
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<BR>
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a brightness and a contrast setting to a scanner.
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<BR>
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<P>But it does not seem practical to equip an ADC with 256 controls!
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<BR>
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If your scanner does not respond to the standard brightness and
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<BR>
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contrast controls, then the ADC is probably using fixed settings,
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<BR>
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and all picture manipulations are done after digitizing. Then, of
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<BR>
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course, you can do the manipulations just as well in the computer.
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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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</PRE>
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