Actually, to get acceptable results even when converting from RGB to grayscale, you must weight the components unequally. See, for example, https://en.wikipedia

Actually, to get acceptable results even when converting from RGB to grayscale, you must weight the components unequally. See, for example, https://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale https://en.wikipedia.org/wiki/Grayscale#Converting_color_to_...