Color filter is usually installed in front of or behind the lens when in use. It is used to adjust the tone and contrast of the scene, so that the tone of the scene captured by the lens is similar to the degree perceived by the human eye. It can also be used to obtain a certain specific artistic effect. Color filter is widely used in photography creation, printing plate making, color photography and enlargement and various scientific and technological photography.

Color filter has the following functions:

1. Adjust contrast and highlight the subject. In photography practice, color contrast is often used to achieve the purpose of highlighting the subject. For example, when the color of the subject and the background is similar and difficult to distinguish, add a filter of the same color as the subject to make the subject brighter in the photo, so as to achieve the purpose of obvious difference in color between the subject and the background.

2. Adjust the tone to enhance the artistic expression of the picture. The filter can be used to adjust the tone of the photo. By choosing the right filter under certain light conditions, you can shoot the artistic effect you want to express.

3. Adjust the color temperature to suit the color temperature requirements of the photosensitive film. When shooting with color sensitive film, especially when shooting with color reversal film, the color film has very strict requirements on color temperature. Using different color filters under different color temperatures (balanced color temperature filters are special filters) is the guarantee for the color balance of the photosensitive film during color photography.

In short, the color filter is a filter that adjusts the tone and color around the wavelength of light. It is usually a colored filter added in front of or behind the optical lens of the camera. The photography filter is a glass or plastic lens placed in front of the camera lens when taking pictures. It can selectively absorb different bands of light, thereby producing special effects on the photographic works. Color filters have a wide range of applications and are widely used in photography creation, printing plate making and scientific photography. .