Video card anolog converters

[peadunk798]

IF the primary colors on the video card canverters are Blue, Green and Red how does the converter create yellow? Yellow being a primary color, which means it is made up of only one color. http://www.PCGuide.com/ubb/eek.gif The answer to this question gets me 2 points on my final grade on my computor class.

[Randy_tx]

We usually dont "Do" homework for students.......try this: http://www.cs.rit.edu/~ncs/color/t_convert.html

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Will XP save Me ?

[bunk]

The issue here is that there are 2 different kinds of color you are dealing with. Pigment coloration and light coloration.

Light color is the spectrums of light directly given off by the source.
Pigment color that you see is the color of light from a source reflecting off of a surface after certain colors have been absorbed by the pigment. White light is RED LIGHT, BLUE LIGHT, AND GREEN LIGHT COMBINED. The monitor is a light source not a reflecting surface, as a light source the colors you see are determined by the colors rules for light, not pigmentation.

For pigment color the primary colors are red, blue and yellow. Realize that in normal situations the color of an object that you see is white light hitting the surface, then the pigment absorbs some of the colors from the light and the color you see is the colors light that are being reflected. Thus a white surface reflects all light back, you are seeing pretty much the entire spectrum of visible light being reflected. A black object is absorbing most of the visible light and thus no light is being reflected for you to see. When you mix red, blue and yellow paint you are creating a mix that absorbs most visible light and thus doesnt reflect enough light for your eyes to see.

For light color the primary colors are red, blue and green. With light the rules are very different than what you learned from painting.
White light is the 3 primary colors of light combined. As an example you could place a white sheet of paper on a desk in a dark room. Shine a blue light on it and the white reflects blue light back. Shine a blue light, a red light and a green light on the same spot on the paper you would see white.

Yellow light is a mix of red light and green light. So the monitor creates yellow light by turning on the red pixel and green pixel.

This corresponds to yellow colored objects in this manner... White light is red,blue,green light. The white light hits an object we see as yellow. The yellow object is absorbing the blue light, red and green light are reflected back to our eyes.

Summary:

Color of light is all the spectrums of light emitted from a light source.
Color of object is all the spectrums of light reflected from object.

Light primary colors are red blue green.
Pigment primary color are red blue yellow

White light is Red + Blue + Green
Black light is no light.

Black color absorbs Red + Blue + Green ..... no reflecting light = black
White color reflects Red + Blue + Green.... all light reflected = white.

Yellow light is Red + Green light
Yellow color is White light - Blue light... (red,blue,green) - (blue)= (red,green)= yellow

Hope you can get something out of this, I have yet to figure out how to be brief http://www.PCGuide.com/ubb/frown.gif