pnm decoding and encoding
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
P1 20 15
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 0 0 0 1 0 1 0 0 0 0 0 1 0 0 0 0 1 1 
1 1 1 0 1 1 1 1 0 1 0 1 0 1 0 1 1 0 1 1 
1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 1 1 0 1 1 
1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 1 1 0 1 1 
1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 0 0 0 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1