value 0000 0010 has an associated frac of 010 decimal 2 and thus this eight bit shade value is 2 8 of the total number of eight bit color shade increments between shade values 0000 0000 and 0000 1000 thus 2 8 of the pixels in a group for which it is desired to appear as eight bit shade value 0000 0010 are rendered with five bit shade value 00001 and 6 8 of the pixels are rendered with shade value 00000 the left most column in the table in fig2 indicates the fractions associated with each eight bit shade that does not have an equivalent five bit shade referring to fig5 and 6 the proximity information from the frac values is encoded in the ramp values in tables 61 64 through the number of logic 1 values thus ramp value 1111 1110 associated with frac value 7 includes seven logic 1 bits similarly ramp value 1000 0000 includes one logic 1 and is associated with frac value 1 it will be apparent to one of ordinary skill in the art that because the number of logic one values in the ramp tables encodes the desired proximity information any one ramp value need only include the proper number of logic 1 values it is not important which bit positions contain the logic 1 and 0 values thus ramp value 1000 0000 for example can be substituted with 0100 0000 0010 0000 0001 0000 0000 1000 00000100 00000010 and 00000001 referring to fig3 ramp generator 60 uses the frac value received on lines 55 to produce on its output lines 65 a corresponding eight bit ramp value per tables 61 64 multiplexer 70 receives the eight bit ramp value from ramp generator 60 and the.