Development of negative film

The development of American film industry has stimulated the rapid development of photosensitive material production technology. American photography technology has always been in the leading position in the world. The famous negative brands are Kodak, Agfa and Fuji.

China's domestic photosensitive material industry began in the 1940s. Returned overseas Chinese from Nanyang founded Gong Yuan Photosensitive Material Factory in Shantou, Guangdong Province, producing Gong Yuan brand black-and-white film and photographic paper. Since then, Shanghai and Baoding have also produced black and white photographic materials.

The research and development of color photography technology in China started too late, and Baoding began the trial production of color film in the 1970s. Due to poor quality and lack of matching cameras and processors, living space is lost. In the mid-1980s, foreign color photographic materials flooded into China and dominated the China market for more than 20 years, and the photosensitive material industry in China declined completely.

2 1 century, the rapid development of computer technology and the invention of ccd promoted the popularization of digital imaging technology and the complete decline of photosensitive chemical industry.

There are not many people taking pictures with negatives today. Although film has irreplaceable advantages, such as 135 film is larger than most digital cameras (digital media). If you want to take large-scale photos, it is better to use negatives. In addition, the negative film has strong layering, natural color (simulated color), fine picture quality (pixel height) and large tolerance (it is easy to keep bright parts or especially in the case of dark light, the exposure and shooting time will be longer, or it will be developed when developing the negative film (increasing the developer concentration or prolonging the development time), such as Kodak Tri-X 400 photosensitive development to iso 1600, or even.

Although you can take high-quality photos with negative film, you need to be familiar with darkroom skills. Generally speaking, it is difficult for fast film shops to give full play to the advantages of negative films. Therefore, it is best for photographers who use negative films to print photos themselves. For example, they can expose photos in different areas and adjust the contrast and cropping of photos themselves. In addition, because the toxicity of chemicals used in black-and-white printing is much lower than that in color printing, and the printing process is simpler, many people do manual printing in black-and-white darkroom, and color negative films are mostly avoided by automatic printing machine.

Digital photography has incomparable advantages in imaging, storage, transmission, collection and retrieval. The receiver can see the scene in the lens thousands of miles away through the network. Photos stored in the matchbox memory can be piled up in a room with enough film.

With the development of digital technology, the film market is shrinking year by year. However, due to the existence of digital film, the advantages of film photography in the field of large-format photography, and the unique "hair color" of film (referring to the more realistic color of film), film photography may coexist with digital photography for a long time.