Epson 1200 series User Manual page 82

To preview a part of the image that is already in the Preview
window, c lick and drag the mouse over the area you want to see
in detail, and click the zoom preview button.
Note:
You cannot preview an image that exceeds available memory or disk
space. If you attempt to preview an image that is too large, an alert
appears on the screen.
When the mouse pointer is placed within the marquee (the frame of
the selected image area), the mouse pointer changes to a hand icon.
You can click and drag the marquee anywhere in the Preview
window.
When the mouse pointer is placed on the edge of the marquee, it
changes to an arrow allowing you to resize the marquee.
To remove or delete a marquee, double-click on the preview window.
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Using Your Scanner