How are movies classified? What's the difference between printed film and photographic film?

The movie is movie master. Have you ever seen a photographic negative? A movie is a thing. It's just different uses. Generally, films are color-separated, such as ordinary four-color printing. Printing plate-making should produce four films: red, cyan, yellow and black. Of course, according to the needs of printing, spot colors can be added, and the graphic part to be printed in the film is black. Where there is no picture and text, it is blank, and some places need to be screened. The English name of photographic film is film, which means film or film, and some people call it film. The basic components of film are: (1) film used as photosensitizer (also called emulsion); And (2) a membrane substrate for supporting the drug membrane. (1) Film (emulsion) Film is made of photosensitive chemicals on the surface layer (film base) of the film, which consists of some photosensitive crystal particles, and the film base is a transparent film to support the film. The particles in the film can only be seen under a microscope. Therefore, the image taken by film can be enlarged at high magnification. From a certain distance, you may not see obvious particles. This is precisely because the traditional film is far superior to the current digital camera with about 2 to 3 million pixels. The characteristic of medical film is that it will change its structure in real time after exposure, but the specific chemical change characteristics are not important to photographers, especially novices. What matters is the final result of the change. But it is necessary to have a general understanding of its changing principle. When we take pictures, the image beam passes through the lens, enters the camera, and is projected on the film on the film plane, which makes the crystal particles on the film sensitive. After receiving light, crystal particles change their structure and combine with other crystals to form a block. The more light projected on the drug film, the more crystals change and form blocks. The less light is projected on the film, the less crystal changes and caking. Therefore, different luminosity on the film will produce different numbers, sizes and shapes of crystals with changed structures, forming invisible images. This invisible image is called a "latent image". To turn this potential image into a stable and visible image, it is necessary to "develop" the film, which is usually done by the print shop. Popular color negatives will be developed by C-4 1 program or similar program, while slide shows will be developed by E-6 program, but traditional black-and-white films will be developed by D76 program or the program specified by the film. Take black and white film as an example. When the film is developed by D76, the crystal with changed structure will turn into a black syndicate, forming a "negative image". The structure of the crystal that is not irradiated by light will not change, and then it will be washed away by fixing solution in the fixing process, leaving only a light or even transparent part. In this way, the film image is "thick" where there is more light, "thin" where there is less light, and the part without light is transparent, forming a "negative image". The development time and humidity are specified. The film is "thick" after a long time, and "thin" after a long time. (2) Film base The film we mentioned above must be attached to the film base so that it can be fixed on a "plane". The film base of modern film is film, but film can actually be coated on any solid substance, such as paper, glass, cloth and so on. So photos can be made on T-shirts, cups and porcelain. In fact, in the early days, the "film" was coated on glass. Of course, the "movie" at that time was by no means a movie. The film is attached to one side of the film base, one side has a film, and the other side has no film, only a film. To see the right image on the left and right, you must look at the side without the medicine film. When taking pictures or scanning the film, the side with the medicine film must also face down. (II) Types and sizes of films The types of films can be calculated according to the form or size, and there are mainly the following four types: (a) 135mm roll film, (b)IX 240 APS film, (c) 120 roll film and (d) single film. (1) 135 film 135 film is the most popular film form at present, which is widely used in small 35mm cameras, including portable cameras and SLR cameras. This kind of film was originally invented for film cameras, so it can be said to be a film form with a long history. 19 13 Oscar Barnack, the inventor of Leica camera, used this 35mm film for filming on a prototype Leica camera he made, and it became very popular afterwards, making it the most popular film in history. Due to the success of 135 film, "126" and "1 10", which are slightly smaller than 135 film, were "imitated" but both were eliminated, while 135 film was. (2) IX 240 (APS) film This is a new film developed by Kodak, Fuji, Nikon, Canon and Minolta. * * *, 1997 was introduced to the market. It can be said that the film is a "nouveau riche", which is characterized by the addition of information exchange function (IX) on the basis of tradition.