Canon CanoScan FB 1200S User Manual page 52

52
FilmGet FAU User's Guide
How the Input Resolution, Image Size and File Size Relate
To understand the relationship between the three settings, see
the example below of an image scanned in the file mode at
different input resolutions.
Input Resolution (dpi)
Output Resolution (dpi)
Image Size (pixels)
Image Size (cm)
File Size (KB)
* These numbers are approximate and may differ from actual results.
Example with the Input Resolution Changed from 300 to 600 dpi
An input resolution of 600 dpi signifies that one linear inch of the
scanned image contains 600 dots (= pixels). Since the number of
dots has been increased (doubled in this case), the image size
(pixels) has increased (doubled) by a corresponding amount.
300 dpi
1 dot
Scanned at 300
dots per inch
Since the width and height were each doubled, the file size is
quadrupled.
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.
Example with the
Changed to 600
300
300
300 x 200
2.54 x 1.69
180
600 dpi
Scanned at
600 dots per inch
Input Resolution
600
300
600 x 400
5.08 x 3.38
720