text: 
  /* maximum number of colours that can be used.
    actual number is now passed to initcolors */
  #define MAXNETSIZE	256    
  
  /* For 256 colours, fixed arrays need 8kb, plus space for the image
     ---------------------------------------------------------------- */
  
  
  /* four primes near 500 - assume no image has a length so large */
  /* that it is divisible by all four primes */
  #define prime1		499
  #define prime2		491
  #define prime3		487
  #define prime4		503
  
  #define minpicturebytes	(4*prime4)		/* minimum size for input image */
  
  
  