The vertical origin could be placed at the top or at the bottom of the image.
The origin could be defined as an index of zero or one. Thus, the top left pixel could be [0,0] or [1,1] at the user's preference
Relative offsets could be displayed, if the used selects a custom datum (origin), e.g. -23 and +10 could mean 23 rows up and 10 columns right of a user-selected pixel used as a reference.
The x,y coordinates could be displayed as either :
- row, column