Hi, > When you scan a DIN-A4 page with 200x200 dpi and save it e.g. as a > tiff file then you get an image with about 1700 x 2200 pixels. At > this point there is no relation to a size in millimeter, > centimeter, inch or DIN-A3 or something like that.
I don't think this is completely true. Tiff allows you to add a "Resolution" tag that specifies the pixels/inch. So even after saving as a tiff file it's possible to deduce it's original size. The tag, btw, is set correctly by xsane (run tiffinfo on a tiff file saved from SANE). > But there will be nothing like "Scale to DIN-A4", this is not > possible when you do not know the size of a pixel! If you manage to get the resolution (in DPI) of the display then you could even display the image in it's original size. Don't ask me how, but I think it's possible for X11R6. /Oliver