iiopt is a npm package that reduces the sizes of images by compressing them using pngquant and mozjpeg. The compression levels in these tools are fixed to 85.
Iiopt requires Node 8 or later.
iiopt needs imagemagick. In MacOSX, you can install them by using HomeBrew.
brew install imagemagick
Then, install @speee/iiopt using npm:
$ npm install @speee/iiopt
$ iiopt --help
(iikanji ni)nice image optimizer
Usage
$ iiopt <file>
$ iiopt <file> --out-dir <output>
$ iiopt --install-git-hooks
Option
--install-git-hooks, install script that hooks git pre-commit to compress image automatically
--overwrite, -o overwrite images
--apply-new-files, compress images before git commit.
--detect-new-raw-images-from, detecting new raw images in a current working branch.
Example
$ iiopt images/sample.jpg --out-dir ./compressed # compressed images, and the results are stored into ./compressed directory
$ iiopt foo.png -o # overwrite foo.png with compressed image
iiopt --install-git-hooks command embed the following script into the git pre-commit hook.
#!/bin/sh -e
npx iiopt --apply-new-files
iiopt --apply-new-files is a command that compress png and jpg images stored in the git staging area.
Notice:
Currently, also compressed images were recompressed when these were staged.
If you want to commit already compressed images, use git commit --no-verify to skip the git pre-commit hook.
iiopt also has a feature that detects unoptimized images in a current working branch. The feature is run by the following command.
iiopt --detect-new-raw-images-from=${branch}
For ${branch}, you enter the name of the branch to which you want to merge.(ex master, development)
Sample images in this repository are copied from below sites. They are royalty-free.
This repository is under the MIT License.