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#!/bin/bash

# Check if Ghostscript is installed
if ! command -v gs &> /dev/null; then
    echo "Error: Ghostscript is not installed. Please install it first."
    exit 1
fi

# Check if an input file is provided
if [ $# -ne 1 ]; then
    echo "Usage: $0 input.pdf"
    exit 1
fi

input_file="$1"
output_file="optimized_$(basename "$input_file")"

# Verify input file exists and is a PDF
if [ ! -f "$input_file" ]; then
    echo "Error: Input file '$input_file' does not exist."
    exit 1
fi

# Prompt for PDF title
read -p "Enter the PDF title: " pdf_title

# Optimize PDF using Ghostscript with aggressive compression settings
gs \
  -sDEVICE=pdfwrite \
  -dCompatibilityLevel=1.4 \
  -dPDFSETTINGS=/screen \
  -dColorImageDownsampleType=/Bicubic \
  -dColorImageResolution=72 \
  -dGrayImageDownsampleType=/Bicubic \
  -dGrayImageResolution=72 \
  -dMonoImageDownsampleType=/Subsample \
  -dMonoImageResolution=72 \
  -dColorImageDownsampleThreshold=1.0 \
  -dGrayImageDownsampleThreshold=1.0 \
  -dMonoImageDownsampleThreshold=1.0 \
  -dCompressPages=true \
  -dCompressFonts=true \
  -dSubsetFonts=true \
  -dEmbedAllFonts=false \
  -dOptimize=true \
  -dAutoRotatePages=/None \
  -dBATCH \
  -dNOPAUSE \
  -sOutputFile="$output_file" \
  -c "[/Title ($pdf_title) /DOCINFO pdfmark" \
  -f "$input_file"

# Check if optimization was successful
if [ $? -eq 0 ]; then
    echo "Optimization complete. Output saved as '$output_file'."
    # Display file sizes
    original_size=$(stat -f%z "$input_file" 2>/dev/null || stat -c%s "$input_file")
    optimized_size=$(stat -f%z "$output_file" 2>/dev/null || stat -c%s "$output_file")
    echo "Original size: $original_size bytes"
    echo "Optimized size: $optimized_size bytes"
    reduction=$(( (original_size - optimized_size) * 100 / original_size ))
    echo "Size reduction: $reduction%"
else
    echo "Error: PDF optimization failed."
    exit 1
fi

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