Black edge of video

(Mailbox) The image displayed in the picture has a black border around the original photographic picture except the normal picture. This kind of black edge is caused by the difference in size and specification between the original image and the display image after conversion, which is generally called LB.

Its name comes from the fact that the shape of the effective graph in the graph is similar to that of a sealed letter. (For a detailed explanation, please refer to the name origin section described later. )

In addition, except for the invalid blank picture (usually black border) in the animation image, sometimes someone just defines the effective part of the picture as black border, which is wrong. Only by combining the redundant blank picture with the effective picture can its shape conform to the explanation of the word.