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commands.md

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+# Image Processing Commands
+
+These are specific examples for cases where the user needs concrete commands rather than only decision guidance.
+
+## ImageMagick
+
+### Resize
+
+```bash
+magick input.jpg -resize 1920x1080\> output.jpg
+magick input.jpg -resize 800x600! output.jpg
+```
+
+### Format Conversion
+
+```bash
+magick input.jpg -quality 80 output.webp
+magick input.png -background white -flatten output.jpg
+magick input.jpg -quality 75 output.avif
+```
+
+### Orientation and Metadata
+
+```bash
+magick input.jpg -auto-orient output.jpg
+magick input.jpg -auto-orient -strip output.jpg
+identify -verbose input.jpg | grep -i exif
+```
+
+### SVG Optimization and Rasterization
+
+```bash
+npx svgo input.svg -o output.svg
+magick -background none -density 300 input.svg -resize 512x512 output.png
+```
+
+### Batch Processing
+
+```bash
+mogrify -format webp -quality 80 *.jpg
+mogrify -resize 1920x1080\> *.jpg
+```
+
+### Aspect-Ratio Crop
+
+```bash
+magick input.jpg -gravity center -crop 1200x630+0+0 +repage output.jpg
+magick input.jpg -resize 1200x630^ -gravity center -extent 1200x630 output.jpg
+```
+
+## Pillow
+
+### Resize
+
+```python
+from PIL import Image
+
+img = Image.open("input.jpg")
+img = img.resize((800, 600), Image.Resampling.LANCZOS)
+img.save("output.jpg", quality=85)
+```
+
+### WebP Conversion
+
+```python
+from PIL import Image
+
+img = Image.open("input.jpg")
+img.save("output.webp", "WEBP", quality=80, method=6)
+```
+
+### Transparency to White Background
+
+```python
+from PIL import Image
+
+img = Image.open("input.png")
+if img.mode in ("RGBA", "LA", "P"):
+    background = Image.new("RGB", img.size, (255, 255, 255))
+    background.paste(img, mask=img.split()[-1] if img.mode == "RGBA" else None)
+    img = background
+img.save("output.jpg", quality=85)
+```
+
+### Thumbnail
+
+```python
+from PIL import Image
+
+img = Image.open("input.jpg")
+img.thumbnail((300, 300), Image.Resampling.LANCZOS)
+img.save("thumb.jpg", quality=75)
+```
+
+## Built-in and Alternative Tools
+
+### macOS `sips`
+
+```bash
+sips -Z 1600 input.jpg --out output.jpg
+sips -s format webp input.png --out output.webp
+```
+
+- Useful when Pillow or ImageMagick are unavailable.
+- Validate quality and metadata handling because `sips` is convenient, not always the most controllable.
+
+### Sharp (Node.js)
+
+```bash
+npx sharp input.jpg --resize 1600 --webp quality=80 -o output.webp
+npx sharp input.png --flatten background=white --jpeg quality=85 -o output.jpg
+```
+
+- Good for scripted web pipelines and batch conversions.
+- Still inspect transparency flattening, color handling, and output dimensions deliberately.
+
+### `exiftool`
+
+```bash
+exiftool input.jpg
+exiftool -gps:all= -overwrite_original input.jpg
+exiftool -all= -overwrite_original input.jpg
+```
+
+- Useful when metadata handling is the real job.
+- Prefer targeted stripping when rights data or timestamps still matter.
+
+### `ffmpeg` for Animated Images
+
+```bash
+ffmpeg -i input.gif -vf "fps=15,scale=1200:-1:flags=lanczos" output.webm
+ffmpeg -i input.gif -vf "fps=15,scale=1200:-1:flags=lanczos" -loop 0 output.webp
+```
+
+- Better than treating every animation problem as a GIF problem forever.
+
+## Command Traps
+
+- Always auto-orient before final export if EXIF rotation exists.
+- Flatten alpha intentionally when converting transparent images to JPEG.
+- Use `LANCZOS` for final downscaling, not low-quality defaults.
+- Spot-check one file before running a batch command across everything.
+- Prefer writing outputs to a new path instead of overwriting the only good source.
+- Treat `npx` examples as remote-code execution from the package registry and use them only in trusted environments.