Film stock

Film stock is a kind of analogue material that is used to record motion movies or animations in the traditional sense. An image is captured on film by a movie camera, which is then developed, processed, and projected onto a screen by means of a movie projector. In its most basic form, it is a strip or sheet of transparent plastic film base covered with one sided with a gelatin emulsion holding microscopically minuscule light-sensitive silver halide crystals, and on the other with an ink or dye of your choice. The sensitivity, contrast, and resolution of the film are all determined by the sizes and other features of the crystals used. Leaving the emulsion out in the sunlight will cause the colour to gradually darken, but the process is much too sluggish and ineffective to be of any practical use. To do this, a very brief exposure to the picture created by a camera lens is utilised to cause just a very little chemical change that is directly related to how much light is absorbed by the individual crystals used in the experiment. In the emulsion, this results in the formation of an invisible latent picture, which may then be chemically developed to produce a visible photograph. Furthermore, all of the films are sensitive to X-rays and high-energy particles in addition to visible light. The majority of people are at least modestly sensitive to infrared (IR) and ultraviolet (UV) light. There are certain special-purpose films that are sensitive to wavelengths in the infrared (IR) part of the electromagnetic spectrum.
The silver salts in black-and-white photographic film are normally present in a single layer on the film. It is discovered that the silver salts in the exposed grains have been transformed to metallic silver, which shows as a black portion of the film negative when the grains are developed and exposed again. Color film has at least three layers of sensitive material. Because of the dyes that adsorb to the surface of the silver salts, the crystals become very sensitive to varied hues. As a rule of thumb, the blue-sensitive layer is placed first, followed by the green and red layers. In the same way that black-and-white film is turned to metallic silver during developing, colour film is converted to metallic silver as well. When it comes to colour films, the by-products of the development process interact with chemicals known as colour couplers that are either present in the film or in the developer solution to generate coloured dyes, which are then exposed to light. In addition, since the quantity of by-products produced is directly proportional to the amount of exposure and development, the number of dye clouds produced is likewise proportional to the amount of exposure and development. Following development, the silver is turned back into silver salts during the bleaching stage, which concludes the process. It is taken from the film during the repair phase, and it is sometimes recovered for use or sale in the following stages. Only the colour dyes that have developed as a result of the fixing process are left behind, which combine to produce the colourful visible picture. In later colour films, such as the Kodacolor II, there may be as many as 12 emulsion layers, each of which contains as many as 20 distinct chemicals. Film and stock for photography are frequently identical in terms of composition and speed, but different in terms of other criteria such as frame size and length.
Category:Audiovisual introductions in 1889
Category:Film and video technology
Category:Storage media