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61 wiersze
2.9 KiB
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<!-- received="Wed Aug 4 07:44:45 1999 PDT" -->
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<!-- sent="Wed, 04 Aug 1999 07:46:33 -0700" -->
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<!-- name="Stephen Williams" -->
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<!-- email="steve@icarus.com" -->
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<!-- subject="Re: JPEG scanner stuff" -->
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<!-- inreplyto="Pine.LNX.4.10.9908040631590.15999-100000@chef.ecs.soton.ac.uk" -->
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<title>sane-devel: Re: JPEG scanner stuff</title>
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<h1>Re: JPEG scanner stuff</h1>
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<b>Stephen Williams</b> (<a href="mailto:steve@icarus.com"><i>steve@icarus.com</i></a>)<br>
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<i>Wed, 04 Aug 1999 07:46:33 -0700</i>
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<li> <b>Next message:</b> <a href="0055.html">David Fox: "Re: RGBI (was Re: xsane-0.31 available)"</a>
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<li> <b>Previous message:</b> <a href="0053.html">Chris Edwards: "SANE-1.0.1, Linux/m68k 2.0.36 (Amiga), Scanmaker E3+"</a>
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<a href="mailto:njl98r@ecs.soton.ac.uk">njl98r@ecs.soton.ac.uk</a> said:<br>
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<i>> What exactly comes out of your scanners? Is it just a JFIF standard</i><br>
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<i>> header followed by JPEG image data? </i><br>
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<p>
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Well, JFIF is really just an APP marker and some constraints on the<br>
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JPEG stream that follows. DQT and DHT markers, and all the other required<br>
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markers to make a fully formed JPEG compressed stream are present.<br>
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So I'm not quite sure what you mean by "JFIF header followed by JPEG<br>
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image data."<br>
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<p>
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If the image is color, I've had one component per scan, combined the<br>
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color components in a scan, etc. The SOF marker describes the internal<br>
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structure. The scanner boards have hardware jpeg compressors that can<br>
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produce the JFIF images, with a little help from a micoprocessor.<br>
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<p>
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The IJG libjpeg software has no trouble reading these streams.<br>
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<pre>
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--
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Steve Williams "The woods are lovely, dark and deep.
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<a href="mailto:steve@icarus.com">steve@icarus.com</a> But I have promises to keep,
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<a href="mailto:steve@picturel.com">steve@picturel.com</a> and lines to code before I sleep,
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<a href="http://www.picturel.com">http://www.picturel.com</a> And lines to code before I sleep."
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<p>
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<p>
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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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</pre>
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<li> <b>Next message:</b> <a href="0055.html">David Fox: "Re: RGBI (was Re: xsane-0.31 available)"</a>
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<li> <b>Previous message:</b> <a href="0053.html">Chris Edwards: "SANE-1.0.1, Linux/m68k 2.0.36 (Amiga), Scanmaker E3+"</a>
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