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115 wiersze
5.7 KiB
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<!-- received="Mon Mar 15 13:55:18 1999 PST" -->
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<!-- sent="Mon, 15 Mar 1999 15:54:08 -0600" -->
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<!-- name="john allen pitney" -->
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<!-- email="pitney@students.uiuc.edu" -->
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<!-- subject="Re: HP Photosmart R032" -->
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<!-- id="" -->
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<!-- inreplyto="36ED69F5.C9B1CCEB@kirchgessner.net" -->
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<title>sane-devel: Re: HP Photosmart R032</title>
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<h1>Re: HP Photosmart R032</h1>
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<b>john allen pitney</b> (<a href="mailto:pitney@students.uiuc.edu"><i>pitney@students.uiuc.edu</i></a>)<br>
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<i>Mon, 15 Mar 1999 15:54:08 -0600</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#153">[ date ]</a><a href="index.html#153">[ thread ]</a><a href="subject.html#153">[ subject ]</a><a href="author.html#153">[ author ]</a>
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<li> <b>Next message:</b> <a href="0154.html">Nick Lamb: "Re: HP ScanJet IIc ADF report"</a>
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<li> <b>Previous message:</b> <a href="0152.html">Oliver Rauch: "xsane-0.16 with experimental 16 bpp support available"</a>
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</ul>
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<!-- body="start" -->
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<i>> Hi,</i><br>
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<i>> </i><br>
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<i>> I am wondering what HP has done now to the Photosmart. The behaviour</i><br>
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<i>> should be</i><br>
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<i>> that it scans during moving slides into and out of the scanner. For the</i><br>
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<i>> preview</i><br>
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<i>> it should scan while moving into. Then you should be able to select the</i><br>
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<i>> area</i><br>
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<i>> which you want to scan, then for the real scan it is moving outside.</i><br>
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<i>> Anything else</i><br>
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<i>> makes no sense.</i><br>
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<i>> Please try the following: Switch the scanner off and on, start</i><br>
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<i>> xscanimage</i><br>
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<i>> and immediately change the exposure time to "off". Then try to aquire a</i><br>
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<i>> preview</i><br>
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<i>> and to do a scan. Does it also scan only when moving outside ?</i><br>
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<i>> If so, you should try how the scanner works on Windows. For the same</i><br>
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<i>> behaviour</i><br>
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<i>> return the scanner to your dealer.</i><br>
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<p>
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I should have mentioned it in my first email--in the HP Windows software,<br>
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the PhotoSmart (PS) does as expected: it generates a preview as the media goes <br>
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in, and does the final scan as the media comes back out. I'm not sure<br>
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why xscanimage is not doing this. I'll investigate further tonight.<br>
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<p>
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The PS also behaves itself when driven (in Windows) by PScan32 and by <br>
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VueSmart (VueScan now?), two third-party programs for driving the PS. <br>
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VueSmart is a shareware program that acquires the 10-bit data from the PS <br>
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and preforms orange mask removal (for negatives) and gamma correction <br>
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on that, before downsampling to 8-bit output. It does a terrific job, <br>
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and even has canned calibration curves for well over 100 different <br>
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types of film (Kodak Gold 100, Fuji Reala, etc.). <br>
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<p>
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(I've been using the scanner in Windows--with HP software--for several <br>
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months now with success. I just want to run it in Linux using SANE now, <br>
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and have the opportunity due to the new SCSI card.) <br>
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<p>
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<i>> > - The vertical (y) postion of the slide seems to slip by about 1mm each</i><br>
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<i>> > time the slide is fed in and out. In other words, if I draw a crop box in</i><br>
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<i>> > the preview window, I get a same-size box in the output, but it is of</i><br>
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<i>> > a rectangle shifted downward in y 1mm or so. Subsequent feeds shift it</i><br>
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<i>> > more each time, as if the backend or the scanner are loosing track of</i><br>
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<i>> > where the slide is physically.</i><br>
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<i>> > </i><br>
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<i>> </i><br>
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<i>> As from above I suppose that the slide is removed from the scanner</i><br>
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<i>> between preview and scan. So there is no possibility to get a correct</i><br>
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<i>> placed box.</i><br>
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<p>
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The slide isn't completely ejected from the scanner between scans--if I <br>
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hit the "unload media" button in xscanimage, the slide comes all the way <br>
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out and is "released" by the PS's rollers. <br>
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<p>
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<i>> Firmware version R032 seems to have no support for tone maps (at least</i><br>
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<i>> greyscale tonemap which are used with firmware version R029 for gamma</i><br>
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<i>> correction).</i><br>
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<i>> I can show you some places in the hp-backend where you can try to add</i><br>
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<i>> those code for testing. I can not test 30bit support on my own</i><br>
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<i>> Photosmart,</i><br>
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<i>> because R029 does only support 24 bit.</i><br>
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<p>
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I would be very interested in trying this. Over the weekend, I played <br>
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with some code for doing PNM with a MAXVAL == 1023. There is an <br>
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assert depth == 8 somewhere in scanimage, so it's not quite ready for <br>
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10-bit PNM output. Is that correct?<br>
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<p>
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<i>> > Are there</i><br>
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<i>> > any docs from HP specific to the Photosmart?</i><br>
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<i>> > </i><br>
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<i>> </i><br>
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<i>> No. And if they have documentation, it must be specific to the firmware.</i><br>
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<p>
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True. I wonder how the authors of PScan32 and of VueSmart came up with the<br>
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proper SCL codes for driving the PS. Maybe I could learn something by <br>
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running those programs in debug mode and checking the log of SCL commands. <br>
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<p>
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John<br>
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<p>
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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="0154.html">Nick Lamb: "Re: HP ScanJet IIc ADF report"</a>
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||
<li> <b>Previous message:</b> <a href="0152.html">Oliver Rauch: "xsane-0.16 with experimental 16 bpp support available"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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