Code:

const byte PROGMEM lookup[256][13] { // comment after line = 8 bit value, 12 bit gamma corrected value
{0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0}, //0,0
{0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F}, //1,1
{0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F}, //2,1
{0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F}, //3,1
{0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F}, //4,2
{0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F, 0xF0}, //5,2
{0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F, 0xF0}, //6,2
{0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F, 0x0F}, //7,3
Through to
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F, 0xF0}, //247,3842
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0, 0xF0, 0x0F, 0xF0, 0xF0, 0xF0, 0xF0, 0x0F}, //248,3873
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0, 0x0F, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0}, //249,3905
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0, 0x0F, 0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F}, //250,3936
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F}, //251,3968
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0, 0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F}, //252,3999
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F}, //253,4031
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0xF0}, //254,4063
{0xF0, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F} //255,4095

A total of 256 lines each containing 13 bytes of data.
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