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 ]