Original Data:
 [  0 -1 -2 -3 -4 -5 -6 ]
 [  0  0  0  0  0  0  0 ]
 [  0  1  2  3  4  5  6 ]
 [  0  2  4  6  8 10 12 ]

Data as written with transform x+1:
 [  1  0 -1 -2 -3 -4 -5 ]
 [  1  1  1  1  1  1  1 ]
 [  1  2  3  4  5  6  7 ]
 [  1  3  5  7  9 11 13 ]

Data as written with transform x+1 and read with transform x-1:
 [  0 -1 -2 -3 -4 -5 -6 ]
 [  0  0  0  0  0  0  0 ]
 [  0  1  2  3  4  5  6 ]
 [  0  2  4  6  8 10 12 ]