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<TITLE>sane-devel: Gamma correction for HP</TITLE>
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<META NAME="Author" CONTENT="Michael Zapf (zapf@vsb.informatik.uni-frankfurt.de)">
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<H1>Gamma correction for HP</H1>
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<STRONG>From:</STRONG> Michael Zapf (<A HREF="mailto:zapf@vsb.informatik.uni-frankfurt.de?Subject=Re:%20Gamma%20correction%20for%20HP&In-Reply-To=<38F6CF79.55B5AF1C@vsb.informatik.uni-frankfurt.de>"><EM>zapf@vsb.informatik.uni-frankfurt.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Apr 14 2000 - 00:57:45 PDT
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I am using a HP ScanJet 4p with sane. The images from the scanner have a slight
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<BR>
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blue-green tint. By using a calibration image I found out that the gamma curves
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<BR>
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need to be adjusted; especially the red one must be raised in the mid-tones.
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<BR>
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<P>xscanimage offers a device dialog with the "custom gamma table" selection.
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<BR>
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However, I can only adjust "image intensity", not the separate color channels;
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<BR>
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there are no selections for them. Although the adjustment greatly enhanced the
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<BR>
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quality, the image is still tinted green-blue.
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<BR>
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<P>Are those selections dependend on the scanner backend? (I'm using sane-hp). Does
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<BR>
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the HP backend not allow separate color gamma adjustments?
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<BR>
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<P>Michael
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<BR>
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<PRE>
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--
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* Michael Zapf ----------- <A HREF="http://www.vsb.cs.uni-frankfurt.de/~zapf/">http://www.vsb.cs.uni-frankfurt.de/~zapf/</A>
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* Fachbereich Informatik, Verteilte Systeme und Betriebssysteme
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* (Dept. of Comp.Science, Distributed Systems and Operating Systems)
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* Johann Wolfgang Goethe-Universitaet Frankfurt/Main
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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=<38F6CF79.55B5AF1C@vsb.informatik.uni-frankfurt.de>">majordomo@mostang.com</A>
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