# FLAG TABLE 3.4, Scanning Mode
1 0 Points of first row or column scan in the +i (+x) direction
1 1 Points of first row or column scan in the -i (-x) direction
2 0 Points of first row or column scan in the -j (-y) direction
2 1 Points of first row or column scan in the +j (+y) direction
3 0 Adjacent points in i (x) direction are consecutive
3 1 Adjacent points in j (y) direction is consecutive
4 0 All rows scan in the same direction
4 1 Adjacent rows scans in the opposite direction
# 5-8 Reserved 
