64 96 11 3 255 0 255



The first line of this file describes the cell information
for the picture that it's prefixed to.  
It's in the following
format:


[Width-per-cell] [Height-per-cell] [No of Cells X]
  
  [No of cells Y] [R transparency] [G transparency]
  
  [B transparency]

Where if R, G or B are below 0, there will be no transparency.