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Click the ▼ beside the [Captured Image Size] item in the window to
display the menu below. This setting allows you to select the size
(dimensions expressed in pixels) at which images are captured.
After you have adjusted the settings to your satisfaction, click the
[Capture] button. This will cause TWAIN Driver to capture the image and
display it in the application’s window. When you have finished the
capture, click the [Close] button.
Scanning Images with TWAIN Driver