Correcting skewed images
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Some devices support image correction if the page has been acquired either slanted to the left/right, or if the page has been placed on the scanner where parts of the page lie outside of the acquisition area.
The commands that correct these errors are as follows:
Please note that with both of these commands, your scanner must have TWAIN support for deskewing and/or overscan processing. Many devices do not have these options. To test if your scanner or device has these options, produce a --details log and check for the following information listed below your device's information:
Device_AutoDeskew:value Device_Overscan_Values:value
If deskewing is supported, then the value for Device_AutoDeskew will be 1.
If overscan is supported, then value will be a list of all the available overscan modes, otherwise Unsupported will be the value shown. |