Decrement(prefix) the fastest moving dimension of the iterator's index.*This operator will const rain the iterator within the region(i.e.the *iterator will automatically wrap from the beginning of the row of the region *to the end of the next row of the region) up until the iterator *tries to moves past the first pixel of the region.Here
Increment(prefix) the fastest moving dimension of the iterator's index.*This operator will const rain the iterator within the region(i.e.the *iterator will automatically wrap from the end of the row of the region *to the beginning of the next row of the region) up until the iterator *tries to moves past the last pixel of the region.Here