| |
| |
| |
| |
| |
| |
| |
Human Color PerceptionHuman vision is made possible by the presence of light sensitive cells in the eye called rods and cones. Research has shown that the rods do not seem to be involved in the perception of color in human beings. There are three different types of cones in the retina. Each type of cone detects either red, green, or blue. All other colors we see are mixtures of these three colors. For instance, white is perceived when equal amounts of red, green, and blue are seen. Black is seen when no red, green, or blue (or no light at all) is detected by the eye. The amount of color we see also depends on the strength, concentration, and position of the light source. Lighting conditions can have a profound effect on the perception of color. In imaging systems, colors can be mixed in different ways to produce a desired result for the eye. The mixing methods most commonly used are based on the additive primary colors> and the subtractive primary colors. All colors can be reproduced using either method. Additive Primary ColorsThe additive method of color mixing is based on the assumption that you start with black. That is, if there are no other colors present (the image is black) and you add red, the image will appear red. If you then add blue. The image will appear magenta. The three additive primary colors are red, green, and blue. The following figure illustrates additive primary color mixing.
Subtractive Primary ColorsThe subtractive method of color mixing is based on the assumption that you start with white. All colors are present in equal amounts. If you subtract cyan and yellow from white, the resulting image is magenta. In a green image, subtracting cyan will result in changing the image to yellow. The subtractive primary colors are cyan, yellow, and magenta. The following figure demonstrates subtractive primary color mixing.
|
| 011-505-885-5443 | evertsfnic@hotmail.com | Granada. Km44. Reparto San Juan. Lote #5 |
