|Spanish - Chinese||The Optics Book - Color||Written by:Karen|
The different colors which we see are actually just mixtures of a few colors. Colors can be mixed by addition (which involves the primary colors) or by subtraction (which involves the secondary colors). The concept of color addition and subtraction may be difficult to understand because it conflicts with experience from paints. Therefore it is important to keep in mind that the colors we talk about in physics are of a pure form whereas the paints which we use in the real world are not pure.
The primary colors used in color addition are Red, Green, and Blue. The combination of the primary colors forms white. The color white is seen when an object reflects all color. Red and Green mix to form yellow, Green and Blue mix to form Cyan, and Red and Blue mix to form Magenta. The colors formed from the primary colors are known as the Secondary colors.
The color television uses the concept of color addition. The television has millions of tiny little dots, called pixels. Colors are seen when electron beams shine on these pixels, causing them to glow either red, green, or blue. We see different colors on the screen depending on how the various amounts of the colored pixels are adding together.
The secondary colors are Cyan, Magenta, and Yellow. When these three are mixed together, they form black. Color by subtraction involves the absorption of some colors and the reflection of the colors which weren’t absorbed. The colors that are reflected, are the ones which we see.
|The Optics. Made by Karen, Timothy and, César for ThinkQuest . 1999 - 2000 All rights reserved|