Hi Luke, I did rewrite some parts of the calibration, so there may be some improvements/regressions. Please test the attached patch, it applies against current cvs. I only need the stderr output this time. Try 75 dpi and 1200 dpi, they use different ccd-modes.
As you very probably already realized, the sane-devel list has a mail size limit of 50kb(*6/8 for binary data). If the (compressed)log is larger than that, please reply only to me. Regards, Pierre Luke Campagnola schrieb: > I actually hadn't tried CVS, which was silly, but it turns out the problem > is a little worse there.. the darks may be slightly better but now the > lights are clipped too. I've attached output + pnms. > > Thanks. > > On 1/4/07, Pierre Willenbrock <pie...@pirsoft.dnsalias.org> wrote: >> >> Luke Campagnola schrieb: >> > It's been a while since I originally brought this up, but I've pulled >> out >> > the ol' scanner for another go. >> > to recap: color calibration isn't quite right on my canon lide35--the >> dark >> > colors drop out to black. I turned on SCAN_FLAG_DISABLE_SHADING as you >> > instructed, and as you predicted this recovered my lost dark colors. >> Where >> > should I go from here? Should I crank up SANE_DEBUG_GENESYS and send >> you >> > the >> > scanimage output and *.pnm files? >> > >> > Thanks, Luke >> > >> >> Hi Luke, >> >> Did you try with sane from cvs? There have been some bug fixes. If that >> does not show the dark colors, use SANE_DEBUG_GENESYS=255 and >> SANE_DEBUG_GENESYS_GL841=255 with scanimage in color mode, and send the >> resulting error output and the generated .pnms. >> >> Regards, >> Pierre >> >> > >> > On 3/7/06, Pierre Willenbrock <pie...@pirsoft.dnsalias.org> wrote: >> >> >> >> > - Color reproduction is better with the sane driver than the >> windows >> >> driver, >> >> > which tends to boost the reds way too much (yaay) >> >> > - Brightness reproduction is quite poor with the sane driver. It >> seems >> >> that >> >> > darker colors just drop off to black very quickly. >> >> >> >> A better tool to determine if the bright and dark colors are correctly >> >> reproduced is a histogram tool. You can clearly see, if there is still >> >> room at the bottom and top of the histogram(not too much, as you still >> >> want some useable color values ;-)). >> >> >> >> This reveals that dark colors are cut off for the sane driver, but it >> >> also shows that the windows driver cuts off bright colors. >> >> >> >> Anyway, it shows a incorrect calibration on the sane side. >> > >> > <snip> >> > >> >> To get an unshaded image, you can disable shading correction in >> >> gl841_init_regs_for_scan by changing the flags(last parameter to >> >> gl841_init_scan_regs, currently 0) to include >> SCAN_FLAG_DISABLE_SHADING. >> >> >> >> If the image then still shows dark colors cut off, the offset/exposure >> >> calibration is to blame. Otherwise the shading calibration calculates >> >> incorrect data(which i suspect). >> >> >> >> I should put this lengthy description online somewhere.. >> >> >> >> Regards, >> >> Pierre >> >> >> > >> >> -------------- next part -------------- A non-text attachment was scrubbed... Name: new-calib.patch Type: text/x-patch Size: 20552 bytes Desc: not available Url : http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20070113/10afecf5/new-calib.bin From jante_n...@yahoo.co.uk Sat Jan 13 09:59:45 2007 From: jante_n...@yahoo.co.uk (John) Date: Sat Jan 13 10:07:04 2007 Subject: [sane-devel] Frontend for film scanners Message-ID: <20070113085945.70026.qm...@web86912.mail.ukl.yahoo.com> I have a Minolta dimage III positive film scanner, which can take 4 positive frames at once. I have not been able to find any good software to use with this scanner. Does anyone have a good hint? Preferably I would like to have a piece of software that lets me preview all 4 frames and on a buttonpress scans the four pictures, make some digital processing to improve the quality and saves them to a directory I have choosen and ejects the frameholder and waits for me to repeat the procedure. Would this be hard to do with sane, given that the frameholder must be positioned for individual scans, or is it perpaps just treated as x and y coordinates just as in a flatbed scanner case? --------------------------------- Inbox full of unwanted email? Get leading protection and 1GB storage with All New Yahoo! Mail. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20070113/f81f820a/attachment.html From e...@epo.dk Sat Jan 13 10:20:34 2007 From: e...@epo.dk (Erik P. Olsen) Date: Sat Jan 13 10:41:17 2007 Subject: [sane-devel] Frontend for film scanners In-Reply-To: <20070113085945.70026.qm...@web86912.mail.ukl.yahoo.com> References: <20070113085945.70026.qm...@web86912.mail.ukl.yahoo.com> Message-ID: <45a8a462.1060...@epo.dk> John wrote: > I have a Minolta dimage III positive film scanner, which can take 4 > positive frames at once. > > I have not been able to find any good software to use with this scanner. > Does anyone have a good hint? If you don't find support with sane you could try the commercial product vuescan. You can download the product free from http://www.hamrick.com for evaluation purposes. -- Erik P. Olsen, Civilingeni?r, MSc Solsortvej 30, DK-2000 Frederiksberg, Denmark Phone: +45 38346480, Fax: +45 32106480, Mobil: +45 40765300
