, Netpbm / PPM, / .
PPM :
P6
800 600 255
# followed by 800x600x3 bytes of values between 0 and 255, i.e.
\xFF\x00\x00\x80\x80\x00\x00\xFF\x00\x00\x80\x80\x00\x00\xFF...
# but not escaped
:
P3
800 600 255
# followed by 800x600x3 decimal numbers between 0 and 255, i.e.
255 0 0 128 128 0 0 255 0 0 128 128 0 0 255 ...