Hello, I need a little bit more informations befor testing (sorry for my poor knowledge in scanner)
Selon Pierre Willenbrock <pierre at pirsoft.dnsalias.org>: > I don't know why the image colors are reversed, but it may be worth > trying to flip the sign bits in Genesys_Frontend. If that does nothing, > we need to handle that in code(or i am missing some setting of the gl841). > The other thing you have seen is the half-resolution mode, used for > greater speed when doing lower(i.E. not full) resolutions. > How do you explain yhat with half resolution the image seems to be grayscale and without it seems to be lineart ? > > Subsidary question : what is the small white (perhaps black) rectangle > > in the middle up off page (for calibration) ? > > That may be a small metal clamp holding the glass or the calibration > strip. That is the black(i.E. white) part at the very top. > Under this small rectangle I have a vertical more clear line(same height). Is it because I need to tweek calibration area (without this small rectangle) ? > To summarize, it is a good idea to have bit 4 on, bit 5 is the half > resolution switch. I'd put 0x10 into the 0x6c gpio register. > > As for the calibration area, you will need to change some code: > * comment out genesys_gl841.c:4220:(line numbers may differ) > status = gl841_feed(dev, 280);/*feed to white strip. canon lide 35 only.*/ > * the same for genesys_gl841.c:4821: > status = gl841_feed(dev, 280);/*feed to white strip. canon lide 35 only.*/ > > then you can try what happens when you turn on the led_calibration and > the coarse_gain_calibration. offset_calibration needs a bit more > changes. i think i am having the code needed lying around somewhere. > essentially, the offset calibration needs to be done with leds off. > the shading calibration does need even more changes. > Where to find led_calibration, coarse_gain_calibration ? How to turn them on ? For personnal information : what is shading calibration ???? > Additionally, if you can't get the afe to switch the sign, you need to > do that in the calibration functions(i.E. 65535-value). > Only in calibration function ? Regards Guillaume > Regards, > Pierre >