img-compressor

Overview

img-compressor is a command-line utility written in Go that compresses a directory of JPEG and PNG images using the Zopfli PNG compressor and Guetzli JPEG compressor. An MD5 of each compressed image will be written to a file (img-compressor.txt) so that on the next run, images that have already been compressed will be skipped.

Building

Clone the repo then run the following commands:

go build
go install

To assign a version when building run:

go build -ldflags=-X=main.version=v1.0.0-beta1

Dependencies

This program requires the following programs installed on your system.

• Zopfli PNG compressor v1.0.3
• Guetzli JPEG compressor v1.0.1

On macOS they can be installed using Homebrew with the following commands:

brew install zopfli
brew install guetzli

Usage

usage: img-compressor [OPTIONS]

OPTIONS:
  -dryrun
        Run command without making changes
  -exclude string
        Glob pattern of directories/images to exclude, e.g {".git,*.jpg"}
  -help
        Show help
  -input-dir string
        Path to a directory containing images to compress
  -jpeg-quality int
        Visual quality to aim for expressed as a JPEG quality value (default 84)
  -verbose
        Print a verbose output
  -version
        Print version number


EXAMPLES:
  img-compressor -input-dir images
  img-compressor -input-dir images -dryrun
  img-compressor -input-dir . -exclude .git
  img-compressor -input-dir . -exclude "{*www*,*node_modules*}"

License

MIT License