remember char data goes from 0 to 255, so to get the results you expect your operand should be 255, not 1.
however this still doesn’t quite give the same behavior as multiplying by 1 (they are all 1 less than the original values). i assume the char data is converted to floating point and back, and the decimal points are truncated.
if you intend to do decimal based math operations on data, probably best to used either type long or float32 and convert them to char after the jit.op (which is as simple as sending the output of jit.op into a char matrix of same dim and planecount).
