----- Original Message ----- 
> I have scanned a map with my A4 scanner, but as the map is quite large,
> it did take several scans. Now I try to put the thing back together.
> The identification part is simple, because the map does contain a rectangular
> grid, so that cutting on a grid line is possible. I can also rotate, so
> that the grid is looking rectangular, but:
> * the scanner (a not very expensive Microscan model) is not working completely
>   parallel, so that when the left and lower boundary are fine, the right
>   boundary is changing by 10 pixels to the left (on 3000 for the height).
>   How can I best deal with the distortion?
> * Once I have these rectangular pieces, how do I best put them together
>   to one large map. By now I have scanned with 300dpi and the grid lines
>   are at a disctance of 2cm, so I can calculate at which absolute positions
>   I have to put the parts together, but I did not find a menu to put the
>   data into...
>   (I know that 300dpi is a lot, but I rather scan with high resolution and
>   compact it later...)
> I do have a Duron 800 @ 256MB main memory, so that I can play around a bit
> with large graphics as needed.
> Any ideas?
> Lutz

Are you sure that the map-grid really is orthogonal ?

Any map of the earth is a projection of a globe onto a plane, and that is impossible 
do accurately for simple geometric reasons, there will always be small deficiences in 
the grid requiring a bit of cheating along the edges.


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