A red pigment has the ability to absorb cyan light. That is, red paper can absorb both the primary colors of light, green and blue (recall that cyan light is a mixture of green and blue light). As a result, red and green light are reflected on the paper, and green light is eliminated. Only blue light reaches the back side of the paper.
This property is used in color photography to reproduce objects that are red or pink with natural color. The image is created by exposing film to all three colors of light: red, green, and blue. When these colors combine on the film, the result is white, which indicates a clear area of the photo. Any other color means there is no light at that location during exposure time.
In laboratory experiments, it is possible to determine what colors will be absorbed by a given substance using color filters. For example, if you were to expose film to only red light after placing a red filter over the lens, only red light would reach the film. Therefore, any yellow or blue colors present on the subject would be removed from the picture.
In general, red substances absorb only red and orange wavelengths, while yellow ones also absorb green and blue wavelengths. Blue substances are the only ones that don't absorb any colors of light.
Natural objects are rarely pure red or green; they usually contain some blue as well.
A blue pigment has the ability to absorb yellow light. Blue paper, in other words, can absorb both the red and green main hues of light (recall that yellow light is a mixture of red and green light)...
|Color of Light||Yellow|
|Color of Paper||Red|
When exposed to sunlight, red fabric will seem red. Red fabric seems black in cyan light. In magenta light, however, it will seem blue.
These effects are due to the way that the human eye perceives color. When you look at a red object under normal lighting conditions, your brain combines information from the object's red light sensor with data about other colors it detects simultaneously, resulting in red being perceived as both bright and dark at the same time. You can test this for yourself by looking at a red sheet of paper under a white lamp. It will look black because there is no red light available for the paper to react to. However, if you tilt your head so that only the back of the paper is visible, you should be able to see how much red light is coming from behind the paper.
Red objects also appear darker when viewed in red light than they do under white light. This is because all colors absorb light to some extent, but red absorbs light most strongly of all. So although white light contains equal amounts of red, green, and blue light, when viewed through red-filtered glasses or on a red screen, everything else around it becomes invisible. Only the red remains.
The wavelengths of light reflected by an opaque object to your eye determine its color. All wavelengths are reflected by a white sheet of paper. A piece of red paper reflects exclusively red wavelengths. It absorbs the wavelengths orange, yellow, green, blue, and violet. A piece of blue paper only absorbs blue wavelengths.
When you look at a piece of white paper, it appears black because it is reflecting all the visible wavelengths of light. The colors it is not reflecting appear gray or white.
Because red paper is absorbing blue wavelengths, a piece of red paper will look blue to you. Because blue paper is absorbing red wavelengths, a piece of blue paper will look red to you. If you were to put a piece of blue paper next to a piece of red paper, they would look the same color to you because they're both making them look white.
You can see evidence of this in paint chips. Reds and blues mix to make grays and violets. Oranges and greens mix to make browns. You can also see this with candles. Blues and pinks burn together. Gels add more pink to their color. Greens have a cool effect on them. Reds have a hot effect. Blends are halfway between the two.
As you can see, color mixing occurs when different colors are combined.
1 response The only color that is reflected and transmitted is red. All others have been assimilated. Whether it's called "absorption" or "transmission", it's the same thing, and it happens at every wavelength of the spectrum.
2 responses Red transmits only red light; all other wavelengths are absorbed. Black absorbs all wavelengths of light.
3 responses Red transmits only red light; all other wavelengths are absorbed. Green transmits only green light; all other wavelengths are absorbed. Yellow transmits only yellow light; all other wavelengths are absorbed.
4 responses Red, orange, and yellow absorb all wavelengths of light while blue and violet transmit some wavelengths of light.
5 responses All colors absorb some wavelengths of light. White transmits all wavelengths of light.
6 responses All colors absorb some wavelengths of light. Black transmits none of the wavelengths of light and absorbs all others.
7 responses Blue and purple tend to absorb more of the red light than the blue light. Orange and red tend to absorb more of the blue light than the red light.
8 responses Colors absorb different amounts of each other's wavelengths.