module.exports = function maxValue(imageData) {
    const data = imageData.data;
    for (var i = 0; i < data.length; i += 4) {
        const maxColor = Math.max(data[i], data[i + 1], data[i + 2])
        data[i] = maxColor;
        data[i + 1] = maxColor;
        data[i + 2] = maxColor;
    }
}