ONE_HALF           60 jccolor.c      #define ONE_HALF	((INT32) 1 << (SCALEBITS-1))
ONE_HALF           61 jdcolor.c      #define ONE_HALF	((INT32) 1 << (SCALEBITS-1))
ONE_HALF           73 jdmerge.c      #define ONE_HALF	((INT32) 1 << (SCALEBITS-1))