foreground image; dynamic image
Computing term for an image displayed in the foreground, often used in contrast to a background image or in contexts like image compositing and video overlays.
With this software, you can composite a foreground image and a background image.
背景画像 means 'background image', the counterpart to 前景画像. Together they form a common pair in image processing.
Compound of 前景 (foreground) + 画像 (image). A straightforward technical term.