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The second (back) image transfer is separate from the first (front) transfer. It’s handled as though the scan was two single-sided pages using document feeder. See “Transfer of Multiple Images” in the TWAIN specification 1.9 (page 4-90) for details.
We’re here to help if you get stuck again.
Im using an Avision Scanner, model AV220C2 that support duplex.
I have set it via the twain specification, successfully.
My xfermech is the default, native.
When i scan a page, the call return to me the DIB to only one face of my page. how can i get the two face?