Patterns used in the tools menu. Gray patterns use output device gray 
scales (and are much quicker for many postscript printers); bit patterns
are used for custom filling. 
 
        < GrayPattern 100 FFFFFFFFFFFFFFFF > BLACK
        < GrayPattern  90 DDFF77FFDDFF77FF > 90% gray
        < GrayPattern  70 DD77DD77DD77DD77 > 70% gray
        < GrayPattern  50 AA55AA55AA55AA55 > 50% gray
        < GrayPattern  30 8822882288228822 > 30% gray
        < GrayPattern  10 8800220088002200 > 10% gray
        < GrayPattern   3 8000080080000800 > 3% gray
        < GrayPattern   0 0000000000000000 > WHITE
 
        < BitPattern      0F1E3C78F0E1C387 >
        < BitPattern      0F87C3E1F0783C1E >
        < BitPattern      CCCCCCCCCCCCCCCC >
        < BitPattern      FFFF0000FFFF0000 >
        < BitPattern      8142241818244281 >
        < BitPattern      03060C183060C081 >
        < BitPattern      8040201008040201 >
        < BitPattern      0000000000000000 > NOCOLOR
