For a background material to remove the black background of the material, it is necessary to draw a mask to fill it, but it is too troublesome for some complex materials. The solution is as follows:

1. Double-click the shortcut icon of Adobe After Effects software to start and open this software, enter the editing interface of AE software, and find a new composition command in composition.

2. Pop up the composition setting window. The composition size is set to 1920* 1080 pixels, the pixel aspect ratio is square, and the frame rate is 24. Then click OK to create the AE composition.

3. Double-click the mouse in the blank space of the AE project window to import a transparent background color picture material, that is, a picture in the window. Jpg format, and drag the picture to the stage window.

4. Select the transparent background picture material, find the effect control window, click the right mouse button in this window, and select and execute the generated filling effect.

5. After adding the fill effect, click the filled color block in the effect control to pop up the Color dialog box. Select a color in the Color dialog box, that is, the color of the filling material.

6. In the filling effect setting of the effect control, you can also check the inversion and mask to set different filling effects.

Precautions:

A new setting introduced by AE can limit the multi-processing function of rendering multiple frames at the same time to rendering queues only. When enabled, RAM preview does not use multiprocessing that renders multiple frames at the same time.