What are the principles of red and green glasses in 3D movies? How do you make these glasses yourself?

Three-dimensional film is to use two lenses, such as human eyes, to shoot scenes from two different directions at the same time and make films; During screening, two groups of films shot by two cameras are simultaneously screened by two projectors, so that two slightly different images overlap on the screen. At this time, if you look straight with your eyes, the picture you see is blurred. If you want to watch stereoscopic movies, you must install a polarizer in front of each movie machine, and the role of the polarizer is to play the role of a polarizer. The light emitted from the two projectors becomes polarized light after passing through the polarizer. The polarization directions of the polarizers in front of the left projector and the right projector are perpendicular to each other, so the polarization directions of the two polarized lights are also perpendicular to each other. These two beams of polarized light are projected on the screen and then reflected to the audience, and the direction of polarized light remains unchanged. When the audience watches with the polarized glasses, each eye can only see the corresponding polarized light image, that is, the left eye can only see the picture reflected by the left machine, and the right eye can only see the picture reflected by the right machine, which will produce a three-dimensional effect like direct viewing. This is the principle of three-dimensional movies. Principle of red and green glasses: The movie plays two overlapping pictures, one is red and the other is blue. Because red and green are complementary colors, the blue picture will be filtered out through the red lens, and the same green lens will filter out the red picture, thus achieving the stereoscopic effect of different pictures of the left and right eyes. Simply put, it is to use the polarization principle of light to form a three-dimensional effect through color filtering. The cost is very low, but the relative effect is poor, especially the color can not reflect the true color of things, and other types of glasses, such as polarized light and liquid crystal, have much better effects. Making 3D eyes: Materials: red paper, blue paper, ruler, cardboard, pen, scissors, lipstick glue. Colored paper is bought from a nearby stationery store, and a large piece is only 12 yuan. I found cardboard in the recycling bin and a cardboard to be thrown away.

Step 1: Pick up your glasses and draw a shape on a thick paper board with a pen. Remember to draw a thicker picture frame, which will be more durable; Draw the bridge of the nose a little bigger, which will better match the shape of the nose; The frame supporting the glasses should be made longer. If it is too long, it can be cut short; if it is too short, it is hopeless. Everything is difficult at the beginning, please underline it carefully. Glasses with horns and diamonds.

Step 2: After cutting the shape of the glasses, cut off the cardboard of the glasses frame with a blade. Thick cardboard is difficult to cut.

Step 3: Stick red paper on the left eye and blue paper on the right eye with lipstick glue. Don't make mistakes. In addition, if the color is not deep enough, the stereoscopic effect will be poor, and two layers of colored paper can be pasted. If the colored paper is too light, you can stick two layers. Finish the picture and watch the 3D trailer and stills with you.