Canon PIXMA MG4200 Series On-Screen Manual page 647

Available when Output Size is set to anything but Flexible.
Click this button to rotate the cropping frame. Click again to return it to the original orientation.
Data Size
The file size of the preview image when saved in uncompressed TIFF 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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