ORIGINAL: K8LH
Curious if anyone has worked out a good "gamma" correction table, say 64 level to 256 level, for RGB or monocolor LED brightness characteristics?

   db .0
    db .1
    db .1
    db .1
    db .1
    db .2
    db .2
    db .2
    db .2
    db .2
    db .2
    db .3
    db .3
    db .3
    db .3
    db .4
    db .4
    db .4
    db .5
    db .5
    db .6
    db .6
    db .7
    db .8
    db .8
    db .9
    db .10
    db .11
    db .12
    db .13
    db .14
    db .15
    db .17
    db .18
    db .20
    db .22
    db .24
    db .26
    db .28
    db .31
    db .34
    db .37
    db .40
    db .44
    db .48
    db .52
    db .57
    db .62
    db .68
    db .74
    db .81
    db .89
    db .97
    db .106
    db .116
    db .126
    db .138
    db .150
    db .164
    db .179
    db .196
    db .214
    db .234
    db .255

ORIGINAL: lbodnar

These ICs are simple SPI LED drivers - each segment has independent driver output. Brightness is still controlled via software PWM.....

'  Leo Bodnar's 'antilogarithmic'
 '  gamma correction algorithm
 '
 '  JustBASIC (free) interpreter
 '
 Input "Gamma steps: "; steps
 Input "  PWM steps: "; range
 
 PRINT
 FOR i = 0 TO steps-1                    '
   x = INT(range^((i+1)/steps)+.3)       '
   if(i=0) then x = 0                    '
   PRINT "  gamma ";                     '
   if(steps > 100) then                  '
     if(i<100) then PRINT " ";           '
   end if                                '
   if(i<10) then PRINT " ";              '
   PRINT i;                              '
   PRINT " = duty cycle ";               '
   if(x < 100) then PRINT "0";           '
   if(x <  10) then PRINT "0";           '
   PRINT x                               '
 NEXT i                                  '
 
 REM CLOSE
 

Gamma steps: 64
   PWM steps: 255
 
   gamma  0 = duty cycle 000
   gamma  1 = duty cycle 001
   gamma  2 = duty cycle 001
   gamma  3 = duty cycle 001
   gamma  4 = duty cycle 001
   gamma  5 = duty cycle 001
   gamma  6 = duty cycle 002
   gamma  7 = duty cycle 002
   gamma  8 = duty cycle 002
   gamma  9 = duty cycle 002
   gamma 10 = duty cycle 002
   gamma 11 = duty cycle 003
   gamma 12 = duty cycle 003
   gamma 13 = duty cycle 003
   gamma 14 = duty cycle 003
   gamma 15 = duty cycle 004
   gamma 16 = duty cycle 004
   gamma 17 = duty cycle 005
   gamma 18 = duty cycle 005
   gamma 19 = duty cycle 005
   gamma 20 = duty cycle 006
   gamma 21 = duty cycle 007
   gamma 22 = duty cycle 007
   gamma 23 = duty cycle 008
   gamma 24 = duty cycle 009
   gamma 25 = duty cycle 009
   gamma 26 = duty cycle 010
   gamma 27 = duty cycle 011
   gamma 28 = duty cycle 012
   gamma 29 = duty cycle 013
   gamma 30 = duty cycle 014
   gamma 31 = duty cycle 016
   gamma 32 = duty cycle 017
   gamma 33 = duty cycle 019
   gamma 34 = duty cycle 021
   gamma 35 = duty cycle 022
   gamma 36 = duty cycle 024
   gamma 37 = duty cycle 027
   gamma 38 = duty cycle 029
   gamma 39 = duty cycle 032
   gamma 40 = duty cycle 035
   gamma 41 = duty cycle 038
   gamma 42 = duty cycle 041
   gamma 43 = duty cycle 045
   gamma 44 = duty cycle 049
   gamma 45 = duty cycle 053
   gamma 46 = duty cycle 058
   gamma 47 = duty cycle 064
   gamma 48 = duty cycle 069
   gamma 49 = duty cycle 076
   gamma 50 = duty cycle 083
   gamma 51 = duty cycle 090
   gamma 52 = duty cycle 098
   gamma 53 = duty cycle 107
   gamma 54 = duty cycle 117
   gamma 55 = duty cycle 127
   gamma 56 = duty cycle 139
   gamma 57 = duty cycle 151
   gamma 58 = duty cycle 165
   gamma 59 = duty cycle 180
   gamma 60 = duty cycle 196
   gamma 61 = duty cycle 214
   gamma 62 = duty cycle 234
   gamma 63 = duty cycle 255