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<!-- received="Sat Feb 7 21:47:20 1998 PST" -->
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<!-- sent="Sat, 7 Feb 1998 21:47:17 -0800" -->
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<!-- name="David Mosberger-Tang" -->
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<!-- email="David.Mosberger@acm.org" -->
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<!-- subject="Re: xscanimage, gtk and gamma curves." -->
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<!-- id="199802080547.VAA15811@panda.mostang.com" -->
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<!-- inreplyto="199801312317.AAA11484@corto.sema.be" -->
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<title>sane-devel: Re: xscanimage, gtk and gamma curves.</title>
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<h1>Re: xscanimage, gtk and gamma curves.</h1>
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<b>David Mosberger-Tang</b> (<a href="mailto:David.Mosberger@acm.org"><i>David.Mosberger@acm.org</i></a>)<br>
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<i>Sat, 7 Feb 1998 21:47:17 -0800</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#32">[ date ]</a><a href="index.html#32">[ thread ]</a><a href="subject.html#32">[ subject ]</a><a href="author.html#32">[ author ]</a>
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<li> <b>Next message:</b> <a href="0033.html">David Mosberger-Tang: "Re: Problems with compiling..."</a>
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<li> <b>Previous message:</b> <a href="0031.html">Peter JD Hall: "Re:aha152x and sg problem"</a>
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</ul>
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<!-- body="start" -->
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<i>>>>>> On Sun, 01 Feb 1998 00:17:58 +0100, Didier Carlier <<a href="mailto:carlierd@acm.org">carlierd@acm.org</a>> said:</i><br>
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<p>
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Didier> This a question about the handling of gamma curves with more<br>
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Didier> than 256 entries.<br>
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<p>
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Didier> [snip]<br>
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<p>
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Didier> However, if I press on the gamma button and enter 1.8 in the<br>
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Didier> pop-up window, I get the following:<br>
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<p>
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Didier> [coolscan] 000: 0000 0000 0000 0000 0000 0000 0000 0083<br>
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Didier> [coolscan] 008: 0083 0083 0083 0083 0083 0122 0122 0122<br>
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Didier> [coolscan] 016: 0122 0122 0122 0122 0153 0153 0153 0153 ....<br>
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Didier> [coolscan] 2024 2043 2043 2043 2043 2043 2043 2043 2043<br>
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Didier> [coolscan] 2032 2043 2043 2043 2043 2047 2047 2047 2047<br>
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Didier> [coolscan] 2040 2047 2047 2051 2051 2051 2051 2051 2051<br>
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<p>
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Didier> There are 2 problems here: - the curve is not as smooth as<br>
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Didier> it could be, - the last 6 points are outside of the<br>
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Didier> requested range.<br>
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<p>
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Didier> I could handle the second problem within the backend code,<br>
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Didier> but the first one is much less obvious.<br>
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<p>
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Didier> Am I doing something wrong ? Is this a known<br>
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Didier> problem/limitation ?<br>
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<p>
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The former is a limitation of the current gtkcurve widget. The latter<br>
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is a problem in gtkcurve that I thought had been fixed a while ago.<br>
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If you're using gtk-0.99.x, then the problem obviously hasn't been<br>
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(fully) fixed yet.<br>
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<p>
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The gtkcurve widget is limited to the resolution of the physical<br>
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window that is used to display the curve. So, if you use a window<br>
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that's 256x256 pixels big, the resolution is limited to 1/256th as<br>
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well.<br>
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<p>
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In summary, I don't think you're doing anything wrong. The gtkcurve<br>
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widget certainly could/should be improved, however.<br>
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<p>
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--david<br>
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<p>
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<pre>
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--
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0033.html">David Mosberger-Tang: "Re: Problems with compiling..."</a>
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<li> <b>Previous message:</b> <a href="0031.html">Peter JD Hall: "Re:aha152x and sg problem"</a>
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<!-- nextthread="start" -->
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</ul>
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