In a file called grey.py, write a function
called compute_greyscale(picture)
. This function should
alter the pixels stored inside of the picture object, so
that all three pixel values are averaged and set to that average. Your
function should then display the greyscale picture.
In a file called negative.py, write a function
called compute_negative(picture)
. This function should
alter the pixels stored inside of the picture object, so
that all three pixel values are their negated version. Your
function should then display the negative picture.