why only blue and green colour screens used in photography? can we use any other color than these?
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Green/blue screens are based on the idea of chroma-keying. The idea is that a specific color is chosen and replaced by a different color/background. So, a green colored background can be switched out with a background of, let's say, a weather map.
Technically speaking, the colors can be gray, white, black, or purple, but green and blue are used most often because they "stand out" the best. I say "stand out" in the sense that since chroma-keying is picking up a color and replacing it with a different image, if a weatherman was wearing a red tie while filming on a red screen, the tie would be replaced as well as the background. In the movie/weather/gaming industry, green and blue screens are used.
Blue screens are used in place of green screens because it's generally easier to chroma-key. The color is softer than in a green screen. However, green screens are still more commonly used because of multiple reasons. One of them being the fact that some people like to wear blue clothing. Green screens are also more commonly used because of the color green being the highest luminance of all the color channels (RGB). Green screens are very bright, but because of the high luminance, there is also a high level of light reflection from a green screen, resulting in "green spill".
Technically speaking, the colors can be gray, white, black, or purple, but green and blue are used most often because they "stand out" the best. I say "stand out" in the sense that since chroma-keying is picking up a color and replacing it with a different image, if a weatherman was wearing a red tie while filming on a red screen, the tie would be replaced as well as the background. In the movie/weather/gaming industry, green and blue screens are used.
Blue screens are used in place of green screens because it's generally easier to chroma-key. The color is softer than in a green screen. However, green screens are still more commonly used because of multiple reasons. One of them being the fact that some people like to wear blue clothing. Green screens are also more commonly used because of the color green being the highest luminance of all the color channels (RGB). Green screens are very bright, but because of the high luminance, there is also a high level of light reflection from a green screen, resulting in "green spill".
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