prHow to cut out the image and change the background: First open Premiere and create a new project, import the video with a monochrome background and replace the background image; then drag the video to video track 2 and the background image to video track 1 respectively; finally Switch to the "Effect Controls" window of the video, set the newly added "Chroma Key", and use the "Color" eyedropper to select the background color in the video.
Open Premiere, create a new project, import a video with a single color background and replace the background image
##Drag the video to video track 2 and the background image to video track 1 respectively. (You can add two places to the video here and process only one for before-and-after comparison)
Select a video and find the "Video Effect"-"key in the "Effect" window Control"-"Chroma Key", double-click to apply to the selected video
Switch to the "Effect Control" window of the video and set the newly added "Chroma Key" , use the "Color" eyedropper to pick the background color in the video, and adjust the similarity and blending.
The final effect is as follows.
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