kopia lustrzana https://gitlab.com/sane-project/website
177 wiersze
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177 wiersze
8.2 KiB
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<!-- received="Sun Nov 8 16:12:21 1998 PST" -->
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<!-- sent="Mon, 09 Nov 1998 02:13:59 +0200" -->
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<!-- name="Milon Firikis" -->
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<!-- email="milonf@ariadne-t.gr" -->
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<!-- subject="Apple: Patch for proper scanning" -->
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<title>sane-devel: Apple: Patch for proper scanning</title>
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<h1>Apple: Patch for proper scanning</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>Mon, 09 Nov 1998 02:13:59 +0200</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#66">[ date ]</a><a href="index.html#66">[ thread ]</a><a href="subject.html#66">[ subject ]</a><a href="author.html#66">[ author ]</a>
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<li> <b>Next message:</b> <a href="0067.html">Milon Firikis: "Q: sane-1.0"</a>
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<li> <b>Previous message:</b> <a href="0065.html">Andre Couture: "parallele BizCard Reader ???"</a>
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</ul>
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<!-- body="start" -->
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This is a multi-part message in MIME format.<br>
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--------------906255AA3B0EC6650D2B970E<br>
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Content-Type: text/plain; charset=us-ascii<br>
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Content-Transfer-Encoding: 7bit<br>
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<p>
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Hello<br>
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<p>
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I included and tested a patch that was sent to me by Ian R. Justman.<br>
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This patch allows the backend to scan when the underlying hardware is<br>
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the ColorOneScanner and I suspect that may also help with the<br>
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OneScanner. It doesn't break the AppleScanner. I stressed it during the<br>
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weekend.<br>
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<p>
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The problem with the Apple Scanners lies mostly to the quantization<br>
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algorithm that is used by the underlying hardware. Only the<br>
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ColorOneScanner has well documented quantization methods although I<br>
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hadn't implement them mainly due to the lack of hardware. The other 2<br>
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models needs extreme experimentation in order to guess the algorithm.<br>
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You have practically to reverse engineer the internal algorithm of the<br>
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scanner in order to give correct info to the SANE backend. At least<br>
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these scanners looks robust enough not to explode :-) when out of bounds<br>
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scanning region is specified. Mine for example refuses to scan until you<br>
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specify a valid region. So the<br>
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current status is:<br>
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<p>
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<p>
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AppleScanner :Fully functional.<br>
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<p>
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OneScanner :It may scan.<br>
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You may have quantization problems.<br>
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<p>
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ColorOneScanner :It will scan in non color modes.<br>
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You may have quantization problems.<br>
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<p>
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<p>
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Quantization problems:<br>
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<p>
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When you have quantization problems means that the SANE backend could<br>
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not calculate correctly the number of pixels in X or Y direction (mostly<br>
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in X). This results to unexpected round offs while the SANE may wait<br>
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bigger/smaller image and that may lead to undesired warnings and cropped<br>
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images. A cropped image is most possible a shifted image also. As Ian R.<br>
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Justman said:<br>
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<p>
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<i>> No warnings, no cropped images, but the quantization algorithms introduce</i><br>
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<i>> some really neat effects when there are rounding problems. One mode I</i><br>
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<i>> tried does work right, but it yields a negative image. Otherwise, other</i><br>
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<i>> modes look like a horizontally-rolling picture on a TV set.</i><br>
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<p>
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<p>
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Milon Firikis<br>
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<p>
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PS<br>
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<p>
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I am also attaching a patch containing some correction in my e-mail<br>
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address.<br>
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--------------906255AA3B0EC6650D2B970E<br>
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Content-Type: text/plain; charset=us-ascii; name="apple_buffer"<br>
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Content-Transfer-Encoding: 7bit<br>
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Content-Disposition: inline; filename="apple_buffer"<br>
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<p>
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diff -ur sane-pre0.75.orig/backend/apple.c sane-pre0.75/backend/apple.c<br>
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--- sane-pre0.75.orig/backend/apple.c Thu Oct 29 09:00:43 1998<br>
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+++ sane-pre0.75/backend/apple.c Sun Nov 8 21:18:13 1998<br>
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@@ -2502,7 +2502,8 @@<br>
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<br>
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if (data_length)<br>
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{<br>
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- if (result[3] & 1) /* Scanner Blocked: Retrieve data */<br>
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+ /* if (result[3] & 1) Scanner Blocked: Retrieve data */<br>
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+ if ((result[3] & 1) || data_av)<br>
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{<br>
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DBG (IO_MESSAGE,<br>
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"sane_read: (status) Available in scanner buffer %u.\n",<br>
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diff -ur sane-pre0.75.orig/backend/apple.desc sane-pre0.75/backend/apple.desc<br>
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--- sane-pre0.75.orig/backend/apple.desc Tue Jul 28 07:47:48 1998<br>
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+++ sane-pre0.75/backend/apple.desc Sun Nov 8 21:54:30 1998<br>
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@@ -1,10 +1,10 @@<br>
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;Apple backend .desc file by Milon Firikis.<br>
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<br>
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:backend "apple" ; name of backend<br>
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-:version "0.2" ; version of backend<br>
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+:version "0.31" ; version of backend<br>
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:status :alpha ; :alpha, :beta, :stable, :new<br>
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:manpage "sane-apple" ; name of manpage (if it exists)<br>
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-;:url "<a href="http://www.luser.com/temp/">http://www.luser.com/temp/</a>" ; backend's web page<br>
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+;:url "<a href="http://no.www.page.yet/">http://no.www.page.yet/</a>" ; backend's web page<br>
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<br>
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:devicetype :scanner ; start of a list of devices....<br>
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<br>
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@@ -13,6 +13,6 @@<br>
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:model "Apple Scanner"<br>
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:comment "4bit, 16 shades of gray"<br>
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:model "OneScanner"<br>
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-:comment "8bit, 256 shades of gray (needs work)"<br>
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+:comment "8bit, 256 shades of gray. The backend needs work especially in the quantization code but it may work."<br>
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:model "ColorOneScanner"<br>
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-:comment "truecolor (needs much work)"<br>
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+:comment "truecolor (needs much work) but it scans in non color modes."<br>
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<p>
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--------------906255AA3B0EC6650D2B970E<br>
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Content-Type: text/plain; charset=us-ascii; name="apple_mail"<br>
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Content-Transfer-Encoding: 7bit<br>
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Content-Disposition: inline; filename="apple_mail"<br>
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<p>
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diff -ur sane-pre0.75.orig/AUTHORS sane-pre0.75/AUTHORS<br>
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--- sane-pre0.75.orig/AUTHORS Wed Oct 28 09:41:51 1998<br>
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+++ sane-pre0.75/AUTHORS Sun Nov 8 22:36:02 1998<br>
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@@ -8,6 +8,7 @@<br>
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<br>
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Backends:<br>
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<br>
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+ apple: Milon Firikis<br>
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artec: Chris Pinkham<br>
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coolscan: Didier Carlier<br>
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dc25: Peter Fales<br>
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@@ -59,7 +60,7 @@<br>
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Matthew Marjanovic <<a href="mailto:maddog@mir.com">maddog@mir.com</a>><br>
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Michael K. Johnson <<a href="mailto:johnsonm@redhat.com">johnsonm@redhat.com</a>><br>
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Michel Roelofs <<a href="mailto:michelr@stack.nl">michelr@stack.nl</a>><br>
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-Milon Firikis <<a href="mailto:milonf@isosun.ariadne-t.gr">milonf@isosun.ariadne-t.gr</a>><br>
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+Milon Firikis <<a href="mailto:milonf@ariadne-t.gr">milonf@ariadne-t.gr</a>><br>
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Oliver Rauch <<a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a>><br>
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Patrick Reynolds <<a href="mailto:patrickr@virginia.edu">patrickr@virginia.edu</a>><br>
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Peter Fales <<a href="mailto:psfales@earthling.net">psfales@earthling.net</a>><br>
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diff -ur sane-pre0.75.orig/PROJECTS sane-pre0.75/PROJECTS<br>
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--- sane-pre0.75.orig/PROJECTS Tue Jul 21 08:43:19 1998<br>
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+++ sane-pre0.75/PROJECTS Sun Nov 8 22:37:41 1998<br>
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@@ -23,7 +23,7 @@<br>
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Polaroid wip Dick Bruijn <<a href="mailto:dick@wau.mis.ah.nl">dick@wau.mis.ah.nl</a>> Polaroid SprintScan<br>
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35 LE<br>
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Artec wip Chris Pinkham <<a href="mailto:cpinkham@infi.net">cpinkham@infi.net</a>> Artec AT3<br>
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-Apple wip Milon Firikis <<a href="mailto:milonf@isosun.ariadne-t.gr">milonf@isosun.ariadne-t.gr</a>> AppleScanner (?)<br>
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+Apple wip Milon Firikis <<a href="mailto:milonf@ariadne-t.gr">milonf@ariadne-t.gr</a>> AppleScanner<br>
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Coolscan wip Didier Carlier <<a href="mailto:carlierd@acm.org">carlierd@acm.org</a>> Nikon Coolscan II<br>
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DC25 wip Peter Fales <<a href="mailto:psfales@earthling.net">psfales@earthling.net</a>> Kodak DC25<br>
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DMC wip David Skoll <<a href="mailto:dskoll@chipworks.com">dskoll@chipworks.com</a>> Polaroid Digital<br>
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<p>
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--------------906255AA3B0EC6650D2B970E--<br>
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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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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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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0067.html">Milon Firikis: "Q: sane-1.0"</a>
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<li> <b>Previous message:</b> <a href="0065.html">Andre Couture: "parallele BizCard Reader ???"</a>
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<!-- nextthread="start" -->
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</ul>
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