you take a color set it to a random opacity and then use bucket tool for the bg

8 bits

2 BITS

HALF BIT

H̵̢̱̫̱̩̬͒̄̃̆́̉̍̀̚͠O̴̧̜͉̾́͐̀͠N̶̡͓̖̩̂Ȩ̸͕̱͙̦̞͉̈̎̈́̎͋̿͛̎̓S̴̨̛̘̱̪̣͙̙͂̉̊̓̈́̀͆́͝T̷̙̊̎̇̓̕L̸̛͓͖͖̎͂́́̾̅̓̊͜͠Ỵ̴̗͚̳̉́̈́̂̿́̃̏̒̕ ̶̥̺͆̂̂W̷̼̞̅̅̄̈́̎̋̈́̃͜͝͝H̸̡͈̦͔̘̪̤̳̲͍̓Ą̶̢̞̱͍̬̱̱̇̐̌̌͂Ṫ̷̤͍̣̔̒ ̸͈̺̫͓̠̦̻̼̦̲̈̋I̷͎̙̫͍͆͒̄͐S̷̛͖̘̦̅͊̿̃̎͜ ̸̡̠̤̩̰͚̬̩̻̮͆̈́̄̐̅̀͒̆͝͝T̷̪̗̗͍̗͑̓́H̵̨̨̛̫͖̜͖͈̆̊́͝͝Ḭ̵̳̤̣͍͍͑̍͗̎̅̓̍̅̽͘S̶̨͓̺͙̰͕̯̍ ̸̤̗͉̻̝͆͆̂̔͗̚N̴̢̖͆̿̆͛O̵̖̱̤͙̼̩̥̹̞͈͑I̶̖̬̱̤̍̃̈́S̷̛̟̮̫̰̯̗̣̩̬̘̀̄́̈́̈́͠E̸̥͉̼̣̜͖̰͕͙̘͆͗̓̕ ̵̧̹̼͎̪̱̀̍̓̓L̸̡̛̼͉̣͋̽M̴̡̧͖̝̘͖͎̗̋͒̉̈̔̿͐͜A̷̜̖̘̎̽̈̃̈́̃́͘͠͠ͅO̸̞̖̹̭͒́͊̔͐̏̚