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63 wiersze
3.1 KiB
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<!-- received="Wed May 28 09:05:09 1997 MST" -->
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<!-- sent="Wed, 28 May 1997 17:52:14 +0059 (MDT)" -->
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<!-- name="Mathias Weigt" -->
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<!-- email="p5iba@medchem2.pharmazie.uni-halle.de" -->
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<!-- subject="image buffering" -->
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<!-- id="199705280238.TAA03781@panda.mosberger" -->
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<!-- inreplyto="" -->
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<title>sane-devel: image buffering</title>
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<h1>image buffering</h1>
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<b>Mathias Weigt</b> (<a href="mailto:p5iba@medchem2.pharmazie.uni-halle.de"><i>p5iba@medchem2.pharmazie.uni-halle.de</i></a>)<br>
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<i>Wed, 28 May 1997 17:52:14 +0059 (MDT)</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#29">[ date ]</a><a href="index.html#29">[ thread ]</a><a href="subject.html#29">[ subject ]</a><a href="author.html#29">[ author ]</a>
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<li> <b>Next message:</b> <a href="0030.html">David Mosberger-Tang: "Re: HP support"</a>
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<li> <b>Previous message:</b> <a href="0028.html">David Mosberger-Tang: "Re: SANE/TWAIN"</a>
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<li> <b>Next in thread:</b> <a href="0038.html">Michael K. Johnson: "Re: image buffering"</a>
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<li> <b>Maybe reply:</b> <a href="0038.html">Michael K. Johnson: "Re: image buffering"</a>
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<li> <b>Maybe reply:</b> <a href="0045.html">Michael K. Johnson: "Re: image buffering"</a>
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</ul>
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<!-- body="start" -->
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Servus!<br>
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<p>
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In the last postings the buffering of images was mentioned.<br>
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I thought a little bit and like to know more about it.<br>
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In scanimage.c must_buffer is set for handheld scanners (parm.lines<0)<br>
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or for three pass scanning (either of the three frames).<br>
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I think scanning a full size image (14 x 8.5 inch) at 600 dpi will cost <br>
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125 Mbyte of memory. I don`t have such an amount of memory (only if I double<br>
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my swapspace) and I think not many people on Linux have.<br>
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David mentioned that a temporary file wouldn`t be a nice solution.<br>
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Here is my question: Why not ?<br>
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Shouldn't it be possible to write three temporary files for the red, green and<br>
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blue frame (of course not as image but the red bytes in a line...) so that<br>
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each will consume 1/3 of the entire image in space?<br>
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After the last pass the picture can be put together from those three files<br>
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and send to stdout or file.<br>
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<p>
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<p>
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Mathias Weigt <br>
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<a href="mailto:p5iba@medchem2.pharmazie.uni-halle.de">p5iba@medchem2.pharmazie.uni-halle.de</a><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.azstarnet.com/~axplinux/sane/">http://www.azstarnet.com/~axplinux/sane/</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="0030.html">David Mosberger-Tang: "Re: HP support"</a>
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<li> <b>Previous message:</b> <a href="0028.html">David Mosberger-Tang: "Re: SANE/TWAIN"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0038.html">Michael K. Johnson: "Re: image buffering"</a>
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<li> <b>Maybe reply:</b> <a href="0038.html">Michael K. Johnson: "Re: image buffering"</a>
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<li> <b>Maybe reply:</b> <a href="0045.html">Michael K. Johnson: "Re: image buffering"</a>
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<!-- reply="end" -->
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</ul>
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