Loading
image = ChunkyPNG::Image.from_file('file.png')
Alternate ways
image = ChunkyPNG::Image.from_blob(File.read('file.png'))
image = ChunkyPNG::Image.from_io(io)
Loads from file.png.
Saving
image.save('filename.png')
Alternate ways
File.open('newfile.png', 'wb') { |io| image.write(io) }
binary_string = image.to_blob
Writes an image to newfile.png.
Drawing
image[0, 0] = ChunkyPNG::Color.rgba(255, 0,0, 128)
image.line(1, 1, 10, 1, ChunkyPNG::Color.from_hex('#aa007f'))
Canvas
crop(x, y, w, h)
Transforms
new_image = image.flip_horizontally.rotate_right
0 Comments for this cheatsheet. Write yours!