Color quantization

require('Image::Magick')

func quantize_image(n = 16, input, output='output.png') {
    var im = %O<Image::Magick>.new
    im.Read(input)
    im.Quantize(colors => n, dither => 1)    # 1 = None
    im.Write(output)
}

quantize_image(input: 'Quantum_frog.png')

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