How do you develop photos with film?

Silver salt photographic paper is exposed by laser in a closed dark room, and the silver (silver halide) on the photographic paper is sensitized, and then the coupler in it appears. Finally, the excess substances are washed away by chemicals to form a color image. This is a chemical reaction, a dynamic between molecules, and an image drawn by light, which is called a print photo.

because of its special process of developing photos, its preservation time is also permanent. Printing photos is different from any other imaging method. It is a chemical reaction, which makes the color gradually generate from the inside out, so its color has strong stability. Extended materials

There are black-and-white films, color films and so on.

1. Black-and-white film: According to its color sensitivity, it can be divided into full-color film, color separation film, color blindness film, infrared film, X-ray film, etc. Full-color film is commonly used. Full-color film is for all kinds of colors in nature, and red, orange, yellow, green, cyan, blue and purple can be displayed in different shades of black. In addition to blue and purple in visible light, color separator can also feel yellow and green, but it can't feel red

2. Color film: There are color negatives and color reversal films for photography.

color negatives are mainly used to make color photos; And can directly print and play black and white photos, but the level and contrast of photos are affected to some extent. The sensitivity of color negative film is much smaller than that of black and white film.

The color image, color reproduction and image clarity of color reversal film are better than those of color photos, and printing with color reversal film is better than that of color photos.

Baidu encyclopedia-photo printing

Baidu encyclopedia-film