Fujitsu SCANSNAP S1300I Operator's Manual page 364

Creating Scanned Images Depending on Intended Use (for Mac OS Users)
7.
Press the [Scan] button on the ScanSnap to start a scan.
 Scanned images are saved in the original document sizes.
ATTENTION
If the documents are scanned skewed, the images may not be output in their original sizes.
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