image-tools

Image Tools Skill

Image analysis and manipulation tools.

When to Use

• Extract image metadata (EXIF, dimensions, format)
• Convert between image formats
• Resize or crop images
• Analyze image content
• Get image information

Image Information

Get Image Details

# Using file command
file image.jpg

Using identify (ImageMagick)

identify -verbose image.jpg

Get dimensions

identify -format "%wx%h" image.jpg

Get EXIF data

identify -format "%[EXIF:*]" image.jpg

### Quick Info Script
```bash
#!/bin/bash
# Get basic image info
FILE="$1"
if [ -z "$FILE" ]; then
    echo "Usage: $0 <image-file>"
    exit 1
fi

echo "=== Image Info ==="
file "$FILE"
echo ""
echo "Dimensions:"
identify -format "%wx%h\n" "$FILE"
echo ""
echo "Format:"
identify -format "%m\n" "$FILE"

Image Conversion

Convert Formats

# PNG to JPEG
convert input.png output.jpg

# JPEG to PNG
convert input.jpg output.png

# Convert to grayscale
convert input.jpg -colorspace Gray output.jpg

# Resize
convert input.jpg -resize 800x600 output.jpg
convert input.jpg -resize 50% output.jpg

WebP Conversion

# JPEG to WebP
cwebp input.jpg -o output.webp

# PNG to WebP
cwebp -lossless input.png -o output.webp

Image Analysis

Count Colors

# Unique colors in image
identify -format "%k" input.jpg

Image Histogram

# Get color histogram
convert input.jpg -format %c histogram:info:-

# Simple histogram
identify -verbose input.jpg | grep -A 100 "Histogram:"

OCR (Text Extraction)

# Extract text from image
tesseract image.jpg stdout

# Specific language
tesseract image.jpg stdout -l eng

Screenshots

Capture Screen

# Full screen (Linux)
import -window root screenshot.png

# Region selection
import screenshot.png

# Using scrot (if installed)
scrot -s selection.png

Capture URL as Image

# Using wkhtmltoimage
wkhtmltoimage https://example.com page.png

# Using chromium headless
chromium --headless --screenshot=output.png https://example.com

Useful Tools

Tool	Purpose
file	Detect file type
identify	Get image metadata
convert	Format conversion, resize
composite	Blend images
montage	Create image grids
tesseract	OCR text extraction

Examples

Check if image is valid:

file image.jpg && identify image.jpg >/dev/null 2>&1 && echo "Valid image"

Batch resize:

for f in *.jpg; do convert "$f" -resize 800x600 "thumb_$f"; done

Extract thumbnail:

convert input.jpg -thumbnail 200x200^ -gravity center -extent 200x200 thumb.jpg