chromakey: Chromakey (Green/Blue Screen) Compositing

In compost: Video Compositing via 'FFmpeg'

Chromakey (Green/Blue Screen) Compositing

Description

Remove a colored background from foreground footage and composite onto a background video or image using FFmpeg's chromakey filter.

Usage

chromakey(background, foreground, output, color = "0x00ff00", similarity = 0.1,
          blend = 0.075, overwrite = TRUE, dry_run = FALSE)

Arguments

background	Path to background video or image.
foreground	Path to foreground video with green/blue screen.
output	Path for output video file.
color	Hex color to key out (default "0x00ff00" for green).
similarity	Chromakey similarity threshold (default 0.1). Higher values key out more of the color.
blend	Chromakey blend amount (default 0.075). Higher values create softer edges.
overwrite	If TRUE (default), overwrite output file.
dry_run	If TRUE, return the FFmpeg command without executing.

Value

Invisibly returns the output path. If dry_run, returns command string.

Examples

## Not run: 
chromakey("bg.mp4", "greenscreen.mp4", "out.mp4")
chromakey("bg.mp4", "bluescreen.mp4", "out.mp4", color = "0x0000ff")

## End(Not run)

compost documentation built on Aug. 4, 2026, 5:11 p.m.