modify image with some function. supports only jpeg and png images.
NOTE: i don't know if it's actually flood fill algorithm but name is cool tho :)
go run . -n 1 -op c ./image.jpg
go run . -n 0 -op bw ./image.png
go run . -n {number}
0 - means every color
go run . -op {bw|c}
bw - black & white c - complementary