Canon PIXMA MX870 - Manual (Page 714)

Data Size
An image file is created when the preview image is scanned. Its size when saved in BMP format is
displayed.
Note
When the file size exceeds a certain size, the value appears in red. In that case, a warning
message appears when you click Scan. It is recommended that you adjust the settings to reduce
Data Size. To continue, scan in whole image view.
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Page 714 of 1127 pages Output Settings