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<TITLE>sane-devel: Re: Gamma correction for HP</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@Wolfsburg.DE)">
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<META NAME="Subject" CONTENT="Re: Gamma correction for HP">
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<H1>Re: Gamma correction for HP</H1>
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<!-- received="Fri Apr 14 06:22:50 2000" -->
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<!-- name="Oliver Rauch" -->
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<!-- subject="Re: Gamma correction for HP" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@Wolfsburg.DE?Subject=Re:%20Gamma%20correction%20for%20HP&In-Reply-To=<38F71B66.189B7ACC@wolfsburg.de>"><EM>oliver.rauch@Wolfsburg.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Apr 14 2000 - 06:21:42 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0146.html">Michael Zapf: "Re: Gamma correction for HP"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0144.html">Oliver Rauch: "Re: scanimage -L crashes SuSE 6.4"</A>
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Michael Zapf wrote:
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<BR>
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<P><EM>> I am using a HP ScanJet 4p with sane. The images from the scanner have a slight
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</EM><BR>
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<EM>> blue-green tint. By using a calibration image I found out that the gamma curves
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</EM><BR>
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<EM>> need to be adjusted; especially the red one must be raised in the mid-tones.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> xscanimage offers a device dialog with the "custom gamma table" selection.
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</EM><BR>
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<EM>> However, I can only adjust "image intensity", not the separate color channels;
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</EM><BR>
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<EM>> there are no selections for them. Although the adjustment greatly enhanced the
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</EM><BR>
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<EM>> quality, the image is still tinted green-blue.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Are those selections dependend on the scanner backend? (I'm using sane-hp). Does
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</EM><BR>
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<EM>> the HP backend not allow separate color gamma adjustments?
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>Hi Michael,
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<BR>
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<P>I don`t know the HP backend, but xsane is able to do what you want in software (and hardware
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<BR>
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if supported).
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<BR>
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Take a look at my homepage.
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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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<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:%20Gamma%20correction%20for%20HP&In-Reply-To=<38F71B66.189B7ACC@wolfsburg.de>">Oliver.Rauch@Wolfsburg.DE</A>
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<P><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:%20Gamma%20correction%20for%20HP&In-Reply-To=<38F71B66.189B7ACC@wolfsburg.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0146.html">Michael Zapf: "Re: Gamma correction for HP"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0144.html">Oliver Rauch: "Re: scanimage -L crashes SuSE 6.4"</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 Apr 14 2000 - 06:24:05 PDT</EM>
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