The IMAGERES attribute may be used to specify the resolution of images accessed using the FILE element in Dots Per Inch. Used like this:
the resolution defined in IMAGERES is only used when the image file specifies the resolution as 0 or does not specify the resolution at all. For example,
IMAGERES = "100"
is a useful default for most printers. Alternatively, use
to override resolutions specified in image files and force the IMAGERES value. E.g.
IMAGERES = "-96"
gives good results for viewing an image on-screen.