image-compare
Compare two images pixel-by-pixel and get a visual diff. Use when the user wants to compare their implementation against a design, spot differences between two screenshots, or verify visual regression.
What this skill does
# Image Compare
Compare two images pixel-by-pixel. Returns a diff count, mismatch percentage, and generates a diff image highlighting the differences in red.
## When to Use
- Comparing an implementation screenshot against the original design
- Spotting visual regressions between two versions of a page
- Verifying that a UI matches a Figma export
## How It Works
1. Both images are loaded and resized to match dimensions (uses the smaller of the two)
2. `pixelmatch` compares every pixel and flags differences above a configurable threshold
3. Returns mismatch stats and writes a diff image showing changes in red
## Usage
```bash
bash <skill-path>/scripts/image-compare.sh <image1> <image2> [diff-output.png] [threshold]
```
**Arguments:**
- `image1` — First image path (required)
- `image2` — Second image path (required)
- `diff-output.png` — Path to write the diff image (optional, defaults to `./diff.png`)
- `threshold` — Pixel matching threshold 0-1, lower is stricter (optional, defaults to `0.1`)
**Examples:**
```bash
# Compare a design against implementation
bash <skill-path>/scripts/image-compare.sh design.png screenshot.png
# Compare with custom threshold and output path
bash <skill-path>/scripts/image-compare.sh before.png after.png ./changes.png 0.05
```
## Output
```json
{
"totalPixels": 921600,
"differentPixels": 4523,
"mismatchPercentage": 0.49,
"dimensions": { "width": 1280, "height": 720 },
"diffImage": "./diff.png",
"threshold": 0.1
}
```
| Field | Type | Description |
|--------------------|--------|-------------------------------------------------|
| totalPixels | Number | Total pixels compared |
| differentPixels | Number | Number of pixels that differ |
| mismatchPercentage | Number | Percentage of pixels that differ |
| dimensions | Object | Width and height used for comparison |
| diffImage | String | Path to the generated diff image |
| threshold | Number | Sensitivity threshold used |
## Present Results to User
After comparing, present a summary:
```
Comparison: design.png vs screenshot.png
Mismatch: 0.49% (4,523 pixels out of 921,600)
Diff image saved to: ./diff.png
The images are nearly identical. Differences are highlighted in red in the diff image.
```
Interpret the percentage:
- **< 0.1%** — Essentially identical
- **0.1% - 1%** — Minor differences, likely anti-aliasing or sub-pixel rendering
- **1% - 5%** — Noticeable differences, worth reviewing
- **> 5%** — Significant visual changes
## Troubleshooting
**Different sized images** — The script automatically resizes both images to the smaller dimensions. For best results, use images of the same size.
**Too many false positives** — Increase the threshold (e.g., `0.2`). Anti-aliasing differences are common between browsers.
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