Black-and-white filters and black-and-white negatives take black-and-white photos, right? What is the principle? What's the difference between them? Which is better?

Black-and-white photography of negative film shows scenes with different brightness at different densities, while digital images show fading of color information and different gray levels of brightness after full-color recording. I admit that digital black and white is far less rich in gray scale than negative black and white, which is generally called hierarchy in photography. Forget the graininess, people have different opinions, not everyone likes it. In addition, black and white negative films have different sensitivities to different spectra, such as blue light, purple light and other short-wave light, and are also sensitive to ultraviolet light, while digital images are not. On the website of Mai Sha Photographic Equipment, there is "How does the yellow color filter darken the sky?" ? The article also introduces the principle of black-and-white film photography, which can be combined to study and study.

The black and white filter is added to the lens of digital camera, and the spectral components of incident light have also changed. For example, using the red filter, only the incident light intensity of the object close to red is absorbed by the filter, which changes the brightness and tone distribution of the original shooting scene. Although not as layered as the negative film.