Color printing yellow (minus-blue) overprinted by magenta (minus green) yields red. Where all three inks may overlap, almost all incident light is absorbed or subtracted, yielding near black, but in practical terms it is better and cheaper to use a separate black ink instead of combining three colored inks. The secondary or subtractive colors cyan, magenta and yellow may be considered "primary" by printers and watercolorists (whose basic inks and paints are transparent). Two graphic techniques are required to prepare images for four-color printing. In the "pre-press" stage, original images are translated into forms that can be used on a printing press,
Blue and Green Music Blue and Green Music Blue and Green Music is a 1919–1921 painting by the American painter Georgia O'Keeffe. Painted in her New York years upon the idea that music could be translated into something for the eye, "Blue and Green Music" is a work of rhythm, movement, color, depth, and form. It is also one of the paintings that was expressed by her feelings. The painting uses colors that are both subtle and bold in order to capture the variance of tones that one would find in music. O'Keeffe described music as being able to be "translated into something for