Screenshot capture

Skill PramodDutta/qaskills/seed-skills/screenshot-capture

QA Skills Directory QA Skills is a curated directory of testing-specific skills for AI coding agents (Claude Code, Cursor, Copilot, etc.).

Install

npx -y skills add PramodDutta/qaskills --skill screenshot-capture

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What its author says it does

Copied from the file, not written here

Cross-platform desktop and application screenshot capture for visual testing, UI verification, and automated visual comparison across macOS, Linux, and Windows.

The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

3.3 KB, 651 tokens by cl100k_base, as published. Nobody here has run it

Screenshot Capture Testing

Cross-platform screenshot capture for visual testing, UI verification, and automated comparison. Supports full screen, specific app/window, and pixel region captures.

Tool Priority

Prefer tool-specific screenshot capabilities when available (Playwright for browsers, Figma MCP for designs)
Use this skill for whole-system desktop captures or when tool-specific capture cannot get what you need
Default for desktop apps without a better-integrated capture tool

macOS Capture

Full screen

screencapture -x output/screen.png

Pixel region (x,y,w,h)

screencapture -x -R100,200,800,600 output/region.png

Specific window by ID

screencapture -x -l12345 output/window.png

Interactive selection

screencapture -x -i output/interactive.png

Linux Capture

Using scrot

# Full screen
scrot output/screen.png

# Pixel region
scrot -a 100,200,800,600 output/region.png

# Active window
scrot -u output/window.png

Using gnome-screenshot

gnome-screenshot -f output/screen.png
gnome-screenshot -w -f output/window.png

Using ImageMagick

import -window root output/screen.png
import -window root -crop 800x600+100+200 output/region.png

Windows Capture (PowerShell)

# Full screen
powershell -ExecutionPolicy Bypass -File take_screenshot.ps1

# Pixel region
powershell -ExecutionPolicy Bypass -File take_screenshot.ps1 -Region 100,200,800,600

# Active window
powershell -ExecutionPolicy Bypass -File take_screenshot.ps1 -ActiveWindow

Visual Testing Workflow

Capture baseline — Take reference screenshots of correct UI state
Capture current — Take screenshots of current UI state after changes
Compare — Diff the screenshots to detect visual regressions
Report — Generate visual diff reports with highlighted changes

Multi-Display Behavior

macOS: Full-screen captures save one file per display with multiple monitors
Linux/Windows: Full-screen captures use virtual desktop (all monitors in one image)
Use --region to isolate a single display when needed

Error Handling

On macOS, check Screen Recording permission before window/app capture
On Linux, verify tool availability: command -v scrot, command -v gnome-screenshot
If saving fails with permission errors, check directory permissions
Always report the saved file path in the response

Best Practices

Use consistent viewport sizes for comparable screenshots
Mask dynamic content (timestamps, animations) before comparison
Set appropriate diff thresholds for anti-aliasing tolerance
Store baseline screenshots in version control
Run visual tests in consistent environments (same OS, resolution, DPI)