Purplish blue, navy blue and deep blue are quite close. Navy blue is a transitional color between blue and black, and its pigment and visual sense are lighter than black and darker than blue. Navy blue is generally divided into light navy blue (78 colors) and deep navy blue (79 colors). RGB(0~255,0~255,0~255) values of navy blue and dark blue: (these are the values of three primary colors of red, green and blue respectively), navy blue RGB(0,0, 128), and dark blue RGB(0,0, 139). It is not easy to compare with the naked eye. Dark blue is a little bluer than navy blue, and navy blue is a little darker than dark blue. From the clothing production, or navy blue is better. The appearance rate of navy blue in official occasions is extremely high. It is stable but not too mature, quiet but not too serious, and it is the strongest color of professional temperament, so it is often used in professional clothes.