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_calib
ra tion.ppm.gz
http://www.rainbow-software.org/linux_files/umax_astra_4450/no_gain_calib
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.
Regards,
Stef
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