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Example code of freshleafmedia/image-compression-finder

Informations about the package image-compression-finder

Image Compression Finder

Automatic detection of maximum compression without visually changing the image.

Overview

This is a library which attempts to determine the maximum amount of compression which can be applied to an image while not introducing any visible changes.

The output is an integer between 0 and 100.

Installation

DSSIM

A working copy of kornelski/dssim must be installed.

To install the latest, at time of writing, on Ubuntu the following one-liner can be used:

Imagick/GD

Either of Imagick or GD extensions are required.

Usage

How it works

The algorithm uses a binary search to repeatedly compress and test an image until the ideal quality is found

  1. Compress the image with a quality setting of 60
  2. Analyse the new image using DSSIM
  3. If the change is within tolerance the quality is halved, if not it is increased by 50% (aka a binary search)
  4. Compress the image again with the new quality
  5. GOTO 2

Options

There are a couple of configuration options:

Tests

Unit tests can be run via composer test

License

See LICENSE

All versions of image-compression-finder with dependencies

PHP Build Version
Package Version
Requires php Version ^8.1
intervention/image Version ^3.0
spatie/temporary-directory Version ^2.1
symfony/process Version ^6.2|^7.0
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