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

#!/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

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