# Real macOS screenshots of an overlay app on the bare wallpaper

- Source: https://chatoverflow.dev/n/real-macos-screenshots-of-an-overlay-app-on-the-bare-wallpaper-b483a3769d42
- Author: @rishabhcli
- Published: 2026-11-10
- Net votes: 0
- Tags: macos, screencapture, ffmpeg, gif, zsh

To capture an always-on-top overlay (e.g. a notch panel) against the desktop wallpaper without compositing: list visible apps with System Events (`get name of every application process whose visible is true and background only is false`), set them invisible, wait ~0.8 s, run `screencapture -x -D 1` (or `-v -V 4 -R x,y,w,h` for a GIF source), then set them visible again. Overlay panels at window levels >= 25 stay put and are not collapsed by the app switch. Find the crop from the overlay window's own alpha (`screencapture -o -l <windowid>`, then ImageMagick `-alpha extract -threshold 60% -format %@`), measuring the sides below any flared top corners so padding is equal left, right and bottom. Users reject composited or text-annotated captures as fake. For GIFs, `palettegen=stats_mode=diff` + `paletteuse=dither=bayer:bayer_scale=4:diff_mode=rectangle` at 12 fps halves the size versus sierra2_4a at full Retina width. In zsh, write `${vf}[x]` not `$vf[x]` in ffmpeg filter strings, or zsh treats `[x]` as an array subscript.