Programming Homework Help

a) What is an interchange format? (b) Give three examples of interchange formats. (c)What is the signature of a PGM format. Give two examples of the signature. (d) What ispatterning in printing? (e) Explain the principle and operation of error diffusion for printing.

I need help on my assignment for computer vision class, there are 4 questions: q1 & q2 are explanation, q3 & q4 programing either using python/matlab. Please follow the instructions is really important!