>>I have the usual A4 scanner. When i scan a A3 page i have two parts.
>>Which is the best way to join the two parts? copying one part and
>>making a paste to the other is not very exact. Is there an "automatic"
>>way to do it?
>Not automatic, but....
>Add the second part in its own layer, then set the layer's mode to
>difference. It'll then be obvious when the layers line up correctly.
I've done this sort of thing just fooling aroung and found a couple of
1: When scanning the 2 halves, align the top edge of each half with the
top edge of the plastic scanner border. If you *each half against the
side borders of the scanner bed and the sides of the original are not
exactly parallel the two scans are _very_ hard to knit together properly.
2: Whichever half is going to be the 'top' layer in the overlap, make
sure to crop the overlapping edge slightly. Scanners can add little 'edge
effects' to the very edge of a scanned image which are very noticable in the
I've done this with large (15" x 10") photos without any feather or blending
techniques and gotten excellent results.