kopia lustrzana https://gitlab.com/sane-project/website
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93 wiersze
4.0 KiB
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<!-- received="Fri Sep 3 04:10:06 1999 PDT" -->
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<!-- sent="Fri, 03 Sep 1999 14:12:20 +0300" -->
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<!-- name="Milon Firikis" -->
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<!-- email="milonf@ariadne-t.gr" -->
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<!-- subject="Re: SANE V2 - again..." -->
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<!-- id=" " -->
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<!-- inreplyto="SANE V2 - again..." -->
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<title>sane-devel: Re: SANE V2 - again...</title>
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<h1>Re: SANE V2 - again...</h1>
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<b>Milon Firikis</b> (<a href="mailto:milonf@ariadne-t.gr"><i>milonf@ariadne-t.gr</i></a>)<br>
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<i>Fri, 03 Sep 1999 14:12:20 +0300</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#15">[ date ]</a><a href="index.html#15">[ thread ]</a><a href="subject.html#15">[ subject ]</a><a href="author.html#15">[ author ]</a>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0016.html">Tony Peden: "Microtek E6 Update"</a>
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<li> <b>Previous message:</b> <a href="0014.html">John Garrison: "Re: Scanner help"</a>
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</ul>
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<!-- body="start" -->
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Oliver Rauch wrote:<br>
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<p>
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<i>> Hi Milon,</i><br>
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<i>> </i><br>
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<i>> please reread my mail at first: gamma and halftone tables are needed!</i><br>
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<i>> color correction may be,</i><br>
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<p>
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I usually do that. First read the mails then I say my opinion if I have<br>
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any.<br>
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<p>
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<i>> but what shall a frontend do with a calibration vector:</i><br>
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<i>> what I know about such calibrations is:</i><br>
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<i>> the scanner does scan a white area and sends calibration data</i><br>
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<i>> to the backend, the backend calculates the calibration vector and</i><br>
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<i>> sends it back to the scanner.</i><br>
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<i>> There is nothing a frontend can do with it, because the calibration</i><br>
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<i>> is done different for each scanner-model and vendor.</i><br>
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<i>> </i><br>
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<p>
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I don't want to argue with on what needs to be a "Well Known Option" and<br>
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what not. I was tried to raise the point that there are cases where the<br>
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options which control the quality of a scan are not scalars but vectors<br>
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or tables. Because SANE currently does not suggest a better way of<br>
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letting the user set this non scalar variables, I said that it would be<br>
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possible to have a FILE option that allows the backend to download the<br>
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required info to the scanner.<br>
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<p>
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I admit that my wording may was not clear enough. I said:<br>
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<p>
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#-reading files with array of numbers as information. This would be<br>
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#useful to read/save/store<br>
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# -Calibration vectors (3x256)<br>
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# -Color Correction tables (3x3 integer matrix)<br>
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# -Halftone patterns (4x4, or 8x8 PGM images)<br>
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<p>
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What I meant was that the frontend opens up a browser and let the user<br>
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to select a file. In that way the frontend doesn't need to know what<br>
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calibration is, and how to do it. Backend knows, and the user knows (and<br>
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the README describes the available files :-).<br>
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<p>
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I put the these 4 cases (calibration, halftone, gamma, CCT) together<br>
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because I think that they represent the same problem. I understood what<br>
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you said, that you can eliminate the need of FILE downloading for some<br>
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of them by making them "Well Known Option" but I never disagreed with<br>
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that. I just said that a universal downloading option for FILES as<br>
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argument, may prove handy, if not useful. I didn't want necessarily to<br>
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cover all 4 cases. I most certainly prefer a "Well Known Option" where<br>
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is possible.<br>
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<p>
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MF<br>
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<p>
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PS.<br>
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<p>
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I think this Download File operation is the equivalent of the RAW<br>
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scanning. In both cases the frontend doesn't know what is carrying<br>
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from/to disk/scanner.<br>
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<p>
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<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">majordomo@mostang.com</a>
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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="0016.html">Tony Peden: "Microtek E6 Update"</a>
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<li> <b>Previous message:</b> <a href="0014.html">John Garrison: "Re: Scanner help"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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