Convert image to PPM

img2ppm.jl

using Images, TestImages

img = testimage("cameraman")
img = convert.(RGB{N0f8}, img)

open("cameraman.ppm", "w+") do io
    println(io, "P6")
    println(io, size(img, 2), " ",  size(img, 1))
    println(io, 255)

    for row in eachrow(img)
        for px in row
            write(io, px.r.i)
            write(io, px.g.i)
            write(io, px.b.i)
        end
    end
end