[sane-devel] Benq 5150C / 5250C users: please test
Hi Oliver, I'm replying to the below 2006 message, to confirm that the factor of two problem is present in the latest version. Here's a link to it in the archive: http://lists.alioth.debian.org/pipermail/sane-devel/2006-January/015908.html I had a look at the source code and found the calibration code for 5150 and 5250, but I don't understand it. It would be great to be able to use my 5250C scanner with linux - google also turned up a few other users with the same problem, on ubuntu and other forums. many thanks! Brendan [sane-devel] Benq 5150C / 5250C users: please test Oliver Schwartz Oliver.Schwartz at gmx.de Mon Jan 9 23:24:13 UTC 2006 Hi, Ok, I did some testing with my BenQ 5150C. My first try was in 300dpi color mode (because this was default). There are no color stripes anymore. However, the scanned area was not very wide. Although the full available range ((0,0)x(216.0,297.0)mm^2) was selected in xscanimage. The resulting image had only 109 mm in width and approx. 145 mm in height (measured with millimetre graph paper) This is independent of selected resolution and colour mode. Looks like the measurements are off by a factor of 2. That should be easy to fix.
[sane-devel] Benq 5150C / 5250C users: please test
Hi, Ok, I did some testing with my BenQ 5150C. My first try was in 300dpi color mode (because this was default). There are no color stripes anymore. However, the scanned area was not very wide. Although the full available range ((0,0)x(216.0,297.0)mm^2) was selected in xscanimage. The resulting image had only 109 mm in width and approx. 145 mm in height (measured with millimetre graph paper) This is independent of selected resolution and colour mode. Looks like the measurements are off by a factor of 2. That should be easy to fix. 'Gray' doesn't work. It still results in very distorted Images. When doing 'gray' with xsane there is a message box saying Backend sends more image data than it defined in parameters, after scanning in preview mode. Hm, ok. The backend currently always sends some static calibration data for color mode. I'll try to get some gray scale mode calibration data as well. 'Halftone' sends wrong colours, and sometimes the same patterns as gray. In xscanimage, preview crashes in this mode. This may be related. However, a lot of modern scanners don't support halftoning at all. Does the windows driver offer something similar? At present the calibration algorithm for the 5150 / 5250 is unknown. The calibration data sent to the scanner is currently some static data which may or may not work for all scanners. I'm not a hardware developer. But if you need any data, be free to ask. But as my attempt to sniff on the USB-bus in Windows fired up the whole system and I could not scan anymore until the next reinstall of W2K, I won't do that anymore. I have some data samples, but the hard part is to make an educated guess on the used algorithm. /Oliver
[sane-devel] Benq 5150C / 5250C users: please test
Hi all, I've added some basic support for the Benq 5150C / 5250C scanner to the snapscan backend. Anyone owning such a scanner is encouraged to test it and inform me of any problems. Ok, I did some testing with my BenQ 5150C. My first try was in 300dpi color mode (because this was default). There are no color stripes anymore. However, the scanned area was not very wide. Although the full available range ((0,0)x(216.0,297.0)mm^2) was selected in xscanimage. The resulting image had only 109 mm in width and approx. 145 mm in height (measured with millimetre graph paper) This is independent of selected resolution and colour mode. 'Gray' doesn't work. It still results in very distorted Images. When doing 'gray' with xsane there is a message box saying Backend sends more image data than it defined in parameters, after scanning in preview mode. 'Halftone' sends wrong colours, and sometimes the same patterns as gray. In xscanimage, preview crashes in this mode. Lineart however sends correct data when not selecting quality scan (at first glance, no further investigation done). At the beginning, I had some hangs, which required to hard reset the scanner, but this is not reproducible. At present the calibration algorithm for the 5150 / 5250 is unknown. The calibration data sent to the scanner is currently some static data which may or may not work for all scanners. I'm not a hardware developer. But if you need any data, be free to ask. But as my attempt to sniff on the USB-bus in Windows fired up the whole system and I could not scan anymore until the next reinstall of W2K, I won't do that anymore. Regards, Ben
[sane-devel] Benq 5150C / 5250C users: please test
Hi all, I've added some basic support for the Benq 5150C / 5250C scanner to the snapscan backend. Anyone owning such a scanner is encouraged to test it and inform me of any problems. You can get a snapshot of the latest SANE sources from http://www.sane-project.org/snapshots At present the calibration algorithm for the 5150 / 5250 is unknown. The calibration data sent to the scanner is currently some static data which may or may not work for all scanners. I hope to get this fixed at some point. Anyone who'd like to look into it is welcome to contact me. Regards, Oliver
