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How to set custom scan area?

To easily limit the decoding to the bottom half of the page use the following:

reader.ScanArea = ScanAreaType.BottomHalf;

To specify exact decoding area rectangle:

reader.ScanArea = ScanAreaType.Custom;
reader.CustomAreaLeft = 0;
reader.CustomAreaTop = 0;
reader.CustomAreaWidth = 406;
reader.CustomAreaHeight = 81;

The PDF Multitool is a great tool to get the rectangle area. Just click on the Select button with the cursor icon so you can highlight an area. Download the PDF Multitool here