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PNG Compression Script

This script compresses PNG images in a specified directory and its subdirectories if their file size exceeds a certain threshold. It uses pngquant and optipng to compress the images and remove metadata. Additionally, it resizes images if their resolution exceeds a specified maximum resolution while preserving the aspect ratio.

Prerequisites

Before running the script, ensure you have the following tools installed:

  • pngquant
  • optipng
  • ImageMagick (for identify and convert commands)

You can install them using your package manager. For example, on Ubuntu:

sudo apt-get install pngquant optipng imagemagick

Usage

./compress_png.sh [-t threshold] [-w max_width] [-h max_height] [-c max_colors] [-n min_quality] [-x max_quality] directory Replace directory with the path of the directory containing the PNG images you want to compress.

Options

-t threshold: Threshold size in bytes (default: 409600) -w max_width: Maximum width (default: 1920) -h max_height: Maximum height (default: 1080) -c max_colors: Maximum colors for PNG palette (default: 256) -n min_quality: Minimum PNG compression quality (default: 65) -x max_quality: Maximum PNG compression quality (default: 80)