Image Controls - Epson PERFECTION 1640 SU Reference Manual

Scale slider:
An image can be reduced or enlarged by moving the Scale slider.
You can also click the left or right arrow to change the image size
in 1% increments.
The range of possible reduction or enlargement varies depending
on the current resolution setting.
Scale indicator:
The percentage of enlargement or reduction is shown in the Scale
indicator field. You can type a new value directly into this field,
or use the Scale slider to determine the value.

Image Controls

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Understanding EPSON TWAIN Features