Photographic pictures have a greater degree of discrimination against the ground, while pictures have a lesser degree of discrimination against the ground.

The difference between the picture and the ground usually depends on the picture content, shooting angle, lighting conditions and other factors.

1. High resolution picture: There are significant differences in color, brightness or texture between the subject and the background. From aerial photos, close-up photos and high-contrast photos.

2. Pictures with less discrimination: the color, brightness or texture of the subject and the background are similar or mixed. Forward-looking pictures, head-up angle pictures and low contrast pictures.