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Suppose that at the start of this example you had locked the output
Width and Height. If you then double the magnification to 400%, now
the input data change to resolve the formulas. In this case the scan
resolution is changed to 3600 dpi, the input Height changes to about
7mm, and the input Width is halved to 15 mm.
Suppose that with Lock still on, you change the Magnify value to 800%;
again input data change to resolve the formula. Input Height changes to
about 3mm and input width changes to about 7 mm. However, these
conditions would require a resolution of 7200 dpi, which is beyond the
maximum capability of the scanner (3600 dpi). In this case you see a
message, and the software would reduce input and output.
4. Finally, assume an input Height of 22 mm, a Magnify value of 200%,
and an output Height of 44 mm.
Assume the output Width and Height are unlocked (Lock is un-
checked). If you draw a crop box on the image that changes the input
height to 11 mm, the output height is reduced to 22 mm.
However, if output Width and Height are locked (Lock is checked), and
you draw the same crop box, now the magnification is doubled to
400%. This causes the output Resolution to be halved and the input
width to be halved (to maintain the locked aspect ratio).
Relationships Between Variables
In general the following rules apply to these computations:
If you change an output value (Height, Width or Resolution), the asso-
ciated input value (Height, Width or Resolution respectively), is auto-
matically adjusted. An exception to this occurs when a limitation on the
input value would be broken, that is when the change would result in
exceeding the physical dimension of the frame or the maximum or
minimum resolution.
If you change the magnification, the output Width, Height, and Resolu-
tion are automatically adjusted if Lock is off; otherwise if Lock is on,
the input Width, Height, and Resolution are automatically adjusted.
(Changing input Width and Height means the crop box changes.)
If you change the crop box (therefore changing the input Width and
Height), the associated output Width and Height are changed if Lock is
off; otherwise if Lock is on, the magnification is changed.
