On Monday 11 May 2015 22:05:33 Stef wrote: > On 09/05/2015 00:32, Ondrej Zary wrote: > > On Friday 08 May 2015 21:46:36 Ondrej Zary wrote: > >> On Friday 08 May 2015 16:17:53 Ondrej Zary wrote: > >>> On Thursday 07 May 2015 23:32:28 Ondrej Zary wrote: > >>>> Hello, > >>>> I just got Umax Astra 4450 (same as 4400 except with UTA?) for a while > >>>> and tested it with SANE. Unfortunately, it does not work. The lamp > >>>> turns on and the head moves a bit, then goes back (two times) and the > >>>> scan ends with these errors: > >>>> > >>>> [rts8891] simple_scan: failed to wait for data > >>>> [rts8891] gain_calibration: failed scan data > >>>> [rts8891] sane_start: failed to do gain calibration! > >>>> scanimage: sane_start: Error during device I/O > >>> > >>> I've modified sane_start() in rts8891.c to not fail if > >>> gain_calibration() returns error. It now scans the complete area and > >>> the output resembles what's in the scanner (black template for UTA use > >>> with green text) but it's blurry, shifted horizontally (and the gain is > >>> wrong, of course): > >>> http://www.rainbow-software.org/linux_files/umax_astra_4450/no_gain_cal > >>>ib ra tion.ppm.gz > >>> http://www.rainbow-software.org/linux_files/umax_astra_4450/no_gain_cal > >>>ib ra tion.log > >>> > >>> Looks like there's a problem with the sensor type? > > > > Gain calibration fails because dev->left_offset (and thus xstart) is > > negative. If I set xstart to 4, gain calibration passes (although it's > > wrong: ends after first pass with 0x1f,0x1f,0x1f). > > > > So find_margin() does not work... > > Hello, > > you could try to hardcode gain values at the end of gain > calibration to see if scan is close to be correct.
The dumps from Windows are very different. I've transferred the register settings to sane-rts8891 but with only partial success. 150dpi and 300dpi seems to work if I don't touch 0x7a register. 75dpi, 600dpi and 1200dpi are broken no matter what I tried. The experimental patch is available at http://www.rainbow-software.org/linux_files/umax_astra_4450/umax_astra4450-test.diff -- Ondrej Zary -- sane-devel mailing list: [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to [email protected]
