When I scan with my scanner, all the receipts or documents have a yellow background. How do I fix this?

This is a bug in the scanner driver. You can work around this problem by going into the ReceiptWallet or DocumentWallet Preferences and change Transfer Mode to Memory Based. You can actually reproduce this issue in Image Capture; it is unlikely that scanner vendor will fix this any time soon. We have seen this with EPSON scanners and have had reports of it with HP scanners.