Canon CanoScan FS4000US User Manual page 60

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Adjusting the Scan Settings
How the Input Resolution, Image Size and File Size Relate
To understand the relationship between the three settings, see the example below of image sizes
(pixels) for an image scanned in the file mode at different input resolutions.
1
2
Example with the Input Resolution Changed from 500 to 1000 dpi
An input resolution of 1000 dpi signifies that one linear inch of the scanned image contains
1000 dots (= pixels). Since the number of dots has been increased (doubled in this case), the
3
image size (pixels) has increased (doubled) by a corresponding amount.
4
5
Since the width and height were each doubled, the file size is quadrupled (704 KB x 2 (width) x 2
(height) = 2816 KB in the example above).
When you wish to save a scanned image to a file, it is helpful to keep this relationship in mind. In
this case, there is no need to pay attention to the output resolution.
58
FilmGet FS User's Guide
• These numbers are approximate and
may differ from actual results.

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