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<TITLE>sane-devel: gamma correction on hp 4200c</TITLE>
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<META NAME="Author" CONTENT="Boris Krivulin (boris@coalescent.net)">
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<META NAME="Subject" CONTENT="gamma correction on hp 4200c">
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<H1>gamma correction on hp 4200c</H1>
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<STRONG>From:</STRONG> Boris Krivulin (<A HREF="mailto:boris@coalescent.net?Subject=Re:%20gamma%20correction%20on%20hp%204200c&In-Reply-To=<Pine.LNX.4.10.10101222330020.2140-100000@godel.hypervolume.com>"><EM>boris@coalescent.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Jan 22 2001 - 23:45:05 PST
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Hello,
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<BR>
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<P><P>I have an HP-4200C usb scanner, connected to a PC running linux; a
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<BR>
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no-name video card, and a no-name monitor. The images that I scan are
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<BR>
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too dark. Users of hp4200c driver -- how do you scan your photos ?
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<BR>
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<P>The options for this scanner do not include the brightness
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<BR>
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option, though there are --gamma-table options (separate for red, green,
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<BR>
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and blue).
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<BR>
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<P>I could not figure out what table should I specify to fix my
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<BR>
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pictures. So I used ImageMagick's "mogrify -gamma 2.2" to lighten up the
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<BR>
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images. Nevertheless, the images turn out slightly different from the
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<BR>
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originals.
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<BR>
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<P>Well, I knew how to use mogrify because it only wants a single value, namely
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<BR>
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the gamma correction ^ratio^. How would I do the same with a gamma ^table^,
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<BR>
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and would I get better results anyway ?
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<BR>
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<P>Thank you,
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<BR>
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Boris
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<BR>
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<P>P.S. Scanning often hangs my machine, particularly if I press Ctrl-C
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<BR>
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during a scan, and then try to scan again. I guess that the lamp is not
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<BR>
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returned into a proper place. Has anyone had this ?
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<BR>
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<P><P><P><P><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:%20gamma%20correction%20on%20hp%204200c&In-Reply-To=<Pine.LNX.4.10.10101222330020.2140-100000@godel.hypervolume.com>">majordomo@mostang.com</A>
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</PRE>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Mon Jan 22 2001 - 23:44:37 PST</EM>
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