flicker

Minimal image quality flicker tool: flip between original and compressed images, tune interval, and quickly spot subtle artifacts via blink comparison.

Demo

Open the live demo

Features

• Alternates between two images (A and B)
• Adjustable flip interval (200ms to 5000ms)
• Zoom with the +/− buttons in steps: 1/8×, 1/4×, 1/2×, 1×, 2×, 4×, 8× (1× is actual image size)
• Drag to pan; zoom and pan stay in place while images alternate
• Semi-transparent zoom panel; drag it to reposition it
• Page scrolling works normally over the image
• Per-image source selection:
  • local upload
  • URL
  • fallback to defaults (stem-org.jpg, stem-os.jpg)
• Fullscreen support:
  • Go fullscreen button
  • image double-click
  • zoom and pan controls remain available in fullscreen

Run locally

Open index.html in a browser.

For local HTTP serving (optional):

cd git
python3 -m http.server 8000

Then open http://localhost:8000.