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Manipulate images - resize, crop, convert, add alpha, transform, compress, and analyze. Use when user needs any image manipulation, format conversion, or image information.
Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.
Based on SOC occupation classification
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| name | manipulate-image |
| description | Manipulate images - resize, crop, convert, add alpha, transform, compress, and analyze. Use when user needs any image manipulation, format conversion, or image information. |
| argument-hint | [operation] [image path] [options] |
| allowed-tools | Bash, Read, Write, Glob, AskUserQuestion |
Swiss army knife for image manipulation powered by Pillow.
Run setup check:
bash "${CLAUDE_PLUGIN_ROOT}/skills/manipulate-image/scripts/check-setup.sh"
If it fails, read the install guide:
${CLAUDE_PLUGIN_ROOT}/skills/manipulate-image/scripts/install.md
SCRIPTS="${CLAUDE_PLUGIN_ROOT}/skills/manipulate-image/scripts"
"$SCRIPTS/run.sh" <command> [args...]
| Command | What it does | Instruction file |
|---|---|---|
resize | Scale to width/height/percentage | resize-and-scale.md |
thumbnail | Generate max-size thumbnail | resize-and-scale.md |
crop | Crop by box or center | crop-and-trim.md |
trim | Auto-trim whitespace borders | crop-and-trim.md |
pad | Pad to target size with color | crop-and-trim.md |
convert | Change format (PNG/JPG/WebP) | convert-and-compress.md |
compress | Reduce file size | convert-and-compress.md |
alpha | Add/remove/transparent alpha | alpha-and-composite.md |
composite | Overlay images | alpha-and-composite.md |
rotate | Rotate by degrees | transform.md |
flip | Flip horizontal/vertical | transform.md |
info | Show dimensions, format, mode | analyze.md |
metadata | Extract EXIF data | analyze.md |
check-setup.sh if this is the first use or you hit errorsrun.sh <command> with the right argumentsWhen removing backgrounds from images generated by image-tools:generate-image (or similar AI tools):
Sample the actual background color (AI never produces exact colors):
# from PIL import Image; print(Image.open("image.png").getpixel((0,0)))
Remove with --feather (activates HSV chroma key + spill suppression):
run.sh alpha <image> --transparent "<actual R,G,B>" --tolerance 15 --feather 40 -o <output>
run.sh trim <output> -o <final>
Chroma key palette (the generate-image skill picks the best one based on subject colors):
| Color | Exact RGB | Hex | Approximate AI output |
|---|---|---|---|
| Green | 0, 255, 0 | #00FF00 | varies around (0-20, 240-255, 0-20) |
| Magenta | 255, 0, 255 | #FF00FF | varies around (235-255, 0-20, 235-255) |
| Blue | 0, 0, 255 | #0000FF | varies around (0-20, 0-20, 235-255) |
| Yellow | 255, 255, 0 | #FFFF00 | varies around (235-255, 235-255, 0-20) |
Always sample the actual corner pixel — Gemini never produces the exact requested RGB.
Why --feather matters: Without it, you get binary transparency with colored halos. With it, the algorithm uses HSV hue detection (handles imprecise colors), Gaussian-blurred alpha edges, and spill suppression that removes background color contamination from outline pixels.
See the image-tools:generate-image skill for chroma key color selection rules.
All commands accept: input (file or directory for batch), -o/--output.