Complementary Colors
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-480
2025-12-21
34
If blue and orange are used in the right proportions in Newton's disk, the resulting effect will be practically white. Two colors which, added together, produce white, are called complementary colors.
A chart like that shown in Fig. 1 is convenient for showing complementary colors. It is so arranged that the combination of any two colors opposite will produce white, and the combination of any two spectrum colors will produce the color between them; e.g., red and yellow will produce orange. Yellow and blue in varying proportions will produce varying shades of green; and red and blue in varying proportions will produce varying shades of purple and violet.
The three-color process is a method of making colored pictures of almost any tint or shade of color by using only three colored inks in printing. Photographic negatives of a colored picture are made through screens of red, blue, and yellow. Copper plates are engraved from these and each is inked with its color. By printing these, one over the other, in exact register, very pleasing results are obtained. (The frontispiece of this book is printed by this process.)
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