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Process images for web development — resize, crop, trim whitespace, convert formats (PNG/WebP/JPG), optimise file size, generate thumbnails, create OG card images. Uses Pillow (Python) — no ImageMagick needed. Trigger with 'resize image', 'convert to webp', 'trim logo', 'optimise images', 'make thumbnail', 'create OG image', 'crop whitespace', 'process image', or 'image too large'.
Passed 17 of 22 test cases with the skill, and 11 of 22 without it.
and 6 more in the full report
6 fixed11 passed either way5 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.
I have a directory of raw PNG graphics in `./raw-photos` that I need converted to WebP for my website, saved into `./dist-webp`. Please give me the exact terminal command using `img-process` to run this batch conversion across all images in that folder.
| Checked | Without skill | With skill |
|---|---|---|
| Uses the batch subcommand rather than single-file options or script loops | Missed | Passed |
| Specifies -o ./dist-webp as the target output destination | Missed | Passed |
| Uses action convert to execute format transformation | Missed | Passed |
The instructions your model reads when the skill loads.
Use img-process (shipped in bin/) for common operations. For complex or custom workflows, generate a Pillow script adapted to the user's environment.
img-process resize hero.png --width 1920
img-process convert logo.png --format webp
img-process trim logo-raw.jpg -o logo-clean.png --padding 10
img-process thumbnail photo.jpg --size 200
img-process optimise hero.jpg --quality 85 --max-width 1920
img-process og-card -o og.png --title "My App" --subtitle "Built for speed"
img-process batch ./images --action convert --format webp -o ./optimised
Use img-process when: the operation is standard (resize, convert, trim, thumbnail, optimise, OG card, batch). This is faster and avoids generating a script each time.
Generate a custom script when: the operation needs logic img-process doesn't cover (compositing multiple images, watermarks, complex text layouts, conditional processing).
Pillow is required for both img-process and custom scripts:
pip install Pillow
If Pillow is unavailable, use alternatives:
| Alternative | Platform | Install | Best for |
|---|---|---|---|
sips | macOS (built-in) | None | Resize, convert (no trim/OG) |
sharp | Node.js | npm install sharp | Full feature set, high performance |
ffmpeg | Cross-platform | brew install ffmpeg | Resize, convert |
| Use case | Format | Why |
|---|
test cases passed, vs 11 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.