Pierre Willenbrock schrieb: > Hi, > > Guillaume Gastebois schrieb: >> Hello, >> >> So, what's the next step ? Re-enabling shading ? > > Yes, but only after the shading-calibration is able to get black level > information.(This really needs a better api..)
I commited a prerequisite for shading calibration to work for your scanner. When enabling shading, update from cvs and then use GENESYS_FLAG_DARK_CALIBRATION instead of GENESYS_FLAG_DARK_WHITE_CALIBRATION. Regards, Pierre >> Do you think that last modification "for (i = 150; i..." is necessary ? > > Yes. Some time back, that part of the code just used the middle half of > the scan, exactly to drop the dummy black pixels at the begin. That > didn't work too well, missing some low black levels. > >> Is it time to fine tune registers 52... ? > > Try increasing register 53, 55, 57 by one. Attached is a small program, > that shows the probability of any two-byte pair appearing in a file. It > takes the file as input and dumps an portable anymap(pnm) as output. > I created that program for something completely unrelated, but it proved > useful. > > I used it on offset1_1.pnm(as offset1_0.pnm is only black). > The image should show a fuzzy vertical and horizontal bar, near > top/left. Currently, the horizontal bar is more a line, the vertical bar > is correct(it shows the relationship between the low byte of one pixel > and the high byte of the _next_ pixel). > >> Regards >> Guillaume > > Regards, > Pierre > >> Pierre Willenbrock a ?crit : >>> Guillaume Gastebois schrieb: >>>> Hello, >>>> >>>> Yep, I write "for (j = 150; j...." instead of "for (i = 150; i....." >>>> Now second set seems good. Result is on : >>>> http://ggastebois.free.fr/lide90_snoop/20_test1.tar >>>> >>> Hi, >>> >>> i am sorry, i actually wanted 450, but didn't realize until just now. I >>> missed that the calibration dump images are really grayscale images, >>> although stored in color pnms. 1 pixel in image is 3 pixels for the >>> calibration... >>> >>> I hope this fixes that part of the calibration. >>> >>> Regards, >>> Pierre >>> >>>> Regards >>>> Guillaume >>>> >
