Canon 4205B002 User Manual page 685

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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