Le mardi 02 septembre 2008 ? 21:36 -0400, m. allan noah a ?crit : > > > > Last point concerning the white lines at the bottom: this is simply due > > to the color planes shifting, as the backend algorithm to shift the > > color planes uses only that portion of the image that will contain data > > for the 3 colors. The bottom of the scanned image contains 2 and 1 color > > zones only, due to the color shift. > > So this is a little limitation for pixma CCD sensors, you must select a > > scan zone a little bit bigger at the bottom, then remove the image > > bottom white zone, that is padded on purpose by the backend to keep the > > image size the frontend expects. > > Another solution would have been to send to the frontend a smaller > > image, but this may raise some errors then in the frontend ... > > > > i handle this specific issue for the old fujitsu M3091/2 by requesting > a few more lines from the scanner than the user asked for, and throw > away the extra ones after i shift the color planes. > > allan
In fact, I did not dig too much into this for the moment, your approach looks a good solution; asking for more lines to scan should be simple, and I'll look on how to handle the end image scan condition in the backend. Nicolas
