phase value are in range of 0 to pi. how can i convert them to range of 0-256

i have a result of phase masking . phase values are in range of 0-pi. but as for slm i need them in range of 0-256 how. can convert them .

Answer 1

[Adam]

Surely just the obvious:

result = input * 256 / pi;

works? Where obviously input is your data from 0-pi and result is what you want to get out as the answer from 0-256.