What does the filter mean?

In network language, filter can be extended to a subjective beautification or modification of things. For example, people sometimes add a positive "filter" to themselves or others to show a better or idealized side. This usage sometimes makes people misunderstand the true face of things, because excessive use of filters may cover up the true state of things. The word "filter" usually refers to a tool or technology used to change the visual effect of a photo. It can add various artistic effects or adjust colors to photos, so that photos can present different styles or atmospheres. This concept comes from the field of photography, in which a filter is an actual physical accessory used in front of a camera lens to achieve a specific visual effect. With the development of digital photography technology, filters have also evolved into digital processing technology, which can be added after post-processing by software after photos are taken. Original meaning: filter is a tool to realize various special effects of images in photography, which is usually used for camera lens as color matching and adding effects.