> > Ok but : > > - There are more thant 3 blocks which seems to be image data: 2 for > > calibration and 1 for the picture ? > > What is the format of the sent picture ? RAW ? it might be possible to > > find this no? To be able to determine what size if may have. > > For exemple : 100dpi, 1cm2 is about 39x39 pixels : this represents 1511 > > pixels. 8bits per pixel ? 16 ? (don't know..) if 8 : 4968 hex codes, > > true ? > > > The scanner may scan more than asked for, and the front end will use > what it needs. 39x39 may scan as 40x40 or 64x64 or ..... It is also > possible that 100dpi scans as 150dpi. OK not that likely but be prepared > for it.
it is also possible that the scanner scans full-width of page, even when you ask for less. the way to tell is to take two dumps at two different widths, but leave all else the same. > A colour scan is normally 24bits - 3 bytes per pixel. But again other > values are possible. i would recommend comparing logs of a color scan and a black and white. i have seen really cheap scanner do all scans in jpeg color, and the lineart mode was simulated in the driver. allan > > > > - There is apparently a timeout when sniffing a big scan or a preview : > > my computer my be to slow :( (Athlon 600Mhz, 256RAM). The scan stops at > > that point :( > > > > Now I have to understand libusb in order to try and get an answer of the > > scanner from Linux... > > > > Thanks, > > Thibault > > > > > > > -- "so don't tell us it can't be done, putting down what you don't know. money isn't our god, integrity will free our souls" - Max Cavalera
