Green screen and blue screen are both techniques used in film and video production to superimpose one image over another. The main difference between the two is the color of the background used.
Green screen, also known as chroma key, uses a solid green background. The color green is used because it is less common in skin tones and clothing than other colors, making it easier to separate the subject from the background in post-production. Green screens are also more sensitive to infrared light, which makes it easier to light and gives a cleaner key.
Blue screen, also known as chroma blue, uses a solid blue background. Blue is used because it's a color that is less common in human skin tones, making it easier to separate the subject from the background in post-production. Blue screens are less sensitive to infrared light and can produce a more accurate color key.
It's worth noting that green and blue screens are not the only color choices to use for this technique. The chroma key technique can be applied to any solid color background, but the most common colors used are blue and green.
Another important point to consider is that the final product will not be affected by the color of the background, it is a matter of preference, lighting conditions, and the equipment you have available.
In summary, green screen and blue screen are similar techniques used in film and video production to superimpose one image over another. The main difference between the two is the color of the background used, green and blue respectively. The choice of color will depend on the lighting conditions, equipment available, and preference.