Canon iR3245 Manual page 175

Automatically Specifying the Copy Ratio (Auto XY Zoom)
The XY copy ratio is automatically set to suit the size of the selected paper.
Remark
You cannot copy highly transparent originals, such as
transparencies, in the Auto XY Zoom mode. Manually
specify the copy (zoom) ratio for these types of
originals.
If you set the Auto XY Zoom mode, select the paper
size using the Manual Paper Selection mode. If you do
not select a paper size, Paper Drawer 1 is
automatically selected and the copy ratio is set to
match the size of the paper loaded in that drawer.
If you set the copy ratio in the Auto XY Zoom mode,
Auto Orientation is not performed.
The Auto XY Zoom mode is available for the Copy
function only.
If you notice a difference between the copy (zoom)
ratio and the actual print size, you can try to eliminate
this error by making a Zoom Fine Adjustment in
Adjustment/Cleaning (from the Additional Functions
screen). (See the Reference Guide.)
Setting the X and Y Axes Independently
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