Cleaning Up Whiteboard Photos with a Bash Script

#!/bin/bash

# Input validation
if [ $# -ne 1 ]; then
    echo "Usage: $0 <input_image>"
    exit 1
fi

input_image="$1"
output_svg="${input_image%.*}.svg"
output_png="${input_image%.*}_cleaned.png"

# Check if input file exists
if [ ! -f "$input_image" ]; then
    echo "Error: Input file not found: $input_image"
    exit 1
fi

# Preprocessing: Enhance contrast and remove noise
convert "$input_image" -normalize -sharpen 0x1 -despeckle "$input_image"

# Run autotrace with optimized parameters
autotrace \
    --dpi 1200 \
    --line-threshold 0.05 \
    --color-count 8 \
    --corner-always-threshold 70 \
    --line-reversion-threshold 0.05 \
    --width-weight-factor 0.05 \
    --despeckle-level 15 \
    --despeckle-tightness 3 \
    --preserve-width \
    --remove-adjacent-corners \
    --background-color FFFFFF \
    --output-format svg \
    --output-file "$output_svg" \
    "$input_image"

# Convert SVG to PNG using ImageMagick
convert -density 300 "$output_svg" "$output_png"

echo "Cleaned image saved as: $output_png"
echo "SVG version saved as: $output_svg"