Pkg.clone("https://github.com/FugroRoames/LibPNG.jl.git")

using LibPNG
using ColorTypes

# Write RGB image
pixels = rand(RGB, 10, 10)
writeimage("pixels.png", pixels)
pixels_in = readimage("pixels.png")

# Convert to nchannel × height × width matrix
using ImageCore
pixels_matrix = channelview(pixels_in)
writeimage("pixels_channel.png", pixels_matrix)