What's the difference between red and blue movies and 3d movies?

Red-blue film: Red-blue film refers to the general left-eye red lens and right-eye blue, and the picture is also red-blue dislocation, so that the left-eye lens will filter out the blue content of the picture and only see the red part, and the right eye will filter out the red, so that the left and right eyes will see different pictures, resulting in a three-dimensional effect. Red and blue movies filter different colors through glasses of different colors and see different images.

Three-dimensional film: stereoscopic image: two images overlap to produce a three-dimensional effect. When the audience wears stereoscopic glasses to watch, they feel immersive. Also known as "3D movies". Stereoscopic film is a film that uses the difference of visual angle and convergence function of human eyes to produce stereoscopic effect.

Appeared in 1922. When showing this film, two pictures are superimposed on the screen. Through the audience's special glasses or the radial semi-conical lens grating in front of the screen, the audience's left eye can see the picture taken from the left perspective, and the right eye can see the picture taken from the right perspective, and the stereoscopic image is synthesized through the convergence function of both eyes.

2. Different characteristics

Red and blue movies: The advantages of red and blue movies are cheap and easy to make. It's quite simple in principle, but the effect may not be very good when buying glasses. The key is that there is no standard for the color of "red and blue". The red and blue colors used in different movies are actually different, even not red and blue at all.

Common ones are yellow, green, cyan, magenta and so on. In the cinema, glasses are customized according to the color of the film, so it feels good. When you buy it yourself, you can't match it completely. If the color is almost red or blue, there will be double images, and it is difficult to have a perfect effect.

3d movie: The biggest advantage of linearly polarized light technology is that the stereoscopic effect is slightly better than that of red and green glasses, but there are still obvious ghosting. The projected picture is still not stable enough and the picture is still not clear enough. After watching for a long time, people will still feel tired. The tilt angle of the audience's head should not be greater than 15, otherwise the viewing effect will be affected.

3. Different technologies

Red-blue film: Red-blue film adopts color separation technology, which is another 3D stereoscopic imaging technology. Now it is relatively mature, with red, blue, red and green modes, but the principles adopted are the same.

3d movie: Photometric method, in which two projectors are used to play movies shot by two cameras, and two groups of different images will appear on the screen at the same time.

There will be a polarizer in front of the projector, and the polarizers in front of the two projectors are perpendicular to each other. At this time, looking at the screen with the naked eye can only see the blurred overlapping picture. At this time, you need to watch with polarized glasses. The polarization directions of the lenses are also perpendicular to each other, so each eye can only see the corresponding picture, so that the different contents seen by the two eyes will form a three-dimensional image in your mind.

Color separation, color separation technology is another 3D stereoscopic imaging technology, which mainly has three modes: red-blue, green-red and synthetic violet, but the principles adopted are the same.

The color separation method will print images taken from two different perspectives in two different colors in the same picture. In this way, when playing video, the naked eye can only see the vague ghost, and the stereoscopic effect can only be seen through the corresponding red and blue stereoscopic glasses.

Take red and blue glasses as an example. Only the red image can be seen under the red lens, and only the blue image can be seen under the blue lens. Different images seen by two eyes overlap in the brain, showing a 3D stereoscopic effect.

Baidu encyclopedia-red and blue movies

Baidu Encyclopedia -3d Movie