Canon iR3245 Manual page 486

Press [Original Size] → enter the original size → press [Copy Size] → enter
the copy size.
If the zoom ratio is less than 25%, a message appears telling you that the ratio will be
adjusted to 25%. If it is more than 400%, a message appears telling you that the ratio will be
adjusted to 400%.
Making Copies with Different XY Copy Ratios (XY Zoom):
Press [X] (horizontal direction) and [Y] (vertical direction) for both the original
size and the copy size → enter each value for X and Y.
If the zoom ratio is less than 25%, a message appears telling you that the ratio will be
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adjusted to 25%. If it is more than 400%, a message appears telling you that the ratio will be
adjusted to 400%.
3. Press [Done].
7-18 Calculating the Copy Ratio Based on the Original and Copy Paper Sizes (Zoom Program)