On Sat, Feb 27, 2010 at 12:38 AM, Gernot Hassenpflug <aikishugyo at gmail.com> wrote: > On Fri, Feb 26, 2010 at 11:12 PM, m. allan noah <kitno455 at gmail.com> wrote: >> On Thu, Feb 25, 2010 at 10:03 PM, Gernot Hassenpflug >> <aikishugyo at gmail.com> wrote: >>> On Fri, Feb 26, 2010 at 11:56 AM, m. allan noah <kitno455 at gmail.com> >>> wrote: >>>> On Thu, Feb 25, 2010 at 9:17 PM, Gernot Hassenpflug >>>> <aikishugyo at gmail.com> wrote: >>>>> On Fri, Feb 26, 2010 at 12:38 AM, m. allan noah <kitno455 at gmail.com> >>>>> wrote: >> >> for initial work, I usually write a small libusb program that just >> sends the basic commands required to get image data out. Then I can >> play with that program, and watch how the image changes. Once I >> understand what each command does, then I pick a backend and clone it. > > OK great advice for this newbie, here progress, not much but a start: > 1) ?got a small program running with libusb that gives me the handle > to the device. > 2) ?took usbsniff log of several small scans with different parameters > ? ? (greyscale photo, colour photo, greyscale text, colour text, > colour magazine, OCR, B/W text). > Plan to spend part of weekend seeing how to setup device to do each > such image acquisition.
I thought it might be interesting to note that the resolutions supported by the applications made by Canon for its 8800F scanner are as follows: for paper/photos: 50, 75, 100, 150, 200, 300, 400, 600, 800, 1200 additional resolutions only for color and monochrome negative or positive film: 1600, 2400, 3200, 4800, 6400, 9600 I have no idea what the max resolution of the CCDs is in such a case, if the stepper motor is responsible for the suppsoed increase, for example. I'm sticking to 50dpi and 75dpi for now, varying image sizes by 1 pixel in each direction and changing individual parameters of the scanner software settings. Regards, Gernot
