Screenshot

Capture screens, windows, and regions across platforms with the right tools.

Installer
$clawhub install screenshot

macOS

  • Use screencapture (built-in): screencapture -x output.png for silent capture, -i for interactive selection
  • Capture specific window by PID: screencapture -l$(osascript -e 'tell app "AppName" to id of window 1') out.png
  • For retina displays, output is 2x resolution by default — add -R x,y,w,h to capture exact pixel region
  • iOS Simulator: xcrun simctl io booted screenshot output.png — faster and more reliable than screencapture

Linux

  • gnome-screenshot for GNOME, spectacle for KDE, scrot for minimal/headless
  • Headless X11: xvfb-run scrot output.png — creates virtual display for CI environments
  • Wayland sessions break X11 tools silently — use grim for Wayland, slurp for region selection

Windows

  • PowerShell built-in: Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.Screen]::PrimaryScreen | ... is verbose — prefer nircmd savescreenshot
  • nircmd savescreenshot output.png works from CLI without dependencies on most Windows versions
  • For programmatic capture, python -m PIL.ImageGrab works cross-platform but requires Pillow installed

Web Pages

  • Playwright: npx playwright screenshot URL output.png --full-page — handles JavaScript rendering and scrolling
  • Always wait for network idle: --wait-for-timeout=5000 or page never finishes loading dynamic content
  • Full-page screenshots of long pages pixelate when viewed — split into viewport-sized chunks instead
  • Puppeteer equivalent: page.screenshot({fullPage: true}) after networkidle0

Format and Quality

  • PNG for UI/text (lossless), JPEG for photos (smaller files)
  • JPEG quality 85-92 is optimal — below 80 shows artifacts on text, above 95 gains little
  • WebP offers 25-35% smaller files than JPEG at same quality — supported everywhere except older Safari

Automation Patterns

  • Add timestamps to filenames: screenshot-$(date +%Y%m%d-%H%M%S).png — prevents overwrites in batch jobs
  • For comparison testing, use identical viewport sizes — different resolutions create false diffs
  • CI screenshot artifacts: compress with pngquant or jpegoptim before upload — saves storage and transfer time

Détails

Version
v1.0.0
Téléchargements
2,834
Étoiles
6
ClawHub
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