goptimize/README.md

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# Goptimizer - downscales and optimizes images
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[![Go Report Card](https://goreportcard.com/badge/github.com/axllent/goptimize)](https://goreportcard.com/report/github.com/axllent/goptimize)
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Goptimizer is a commandline utility written in Golang. It downscales and optimizes JPEG, PNG and Gif files.
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Image downscaling/rotation is done within goptimize (`-m <width>x<height>`, see [Usage](#usage-options)), however optimization is done using the following additional tools (if they are installed):
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- jpegoptim
- jpegtran (`libjpeg-turbo-progs`)
- optipng
- pngquant
- gifsicle
## Notes
Both `jpegoptim` & `jpegtran` have almost identical optimization, so if both are installed then just `jpegtran` is used for JPG optimization. PNG optimization however will run through both `optipng` & `pngquant` (if installed) as this has definite advantages.
It is highly recommended to install the necessary optimization tools, however they are not required to run goptimize.
Goptimize will remove all exif data from JPEG files, auto-rotating those that relied on it.
It will also preserve (by default) the file's original modification times (`-p=false` to disable).
## Usage options
```
Usage: ./goptimize [options] <images>
Options:
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-q, --quality int quality, JPEG only (default 75)
-m, --max string downscale to a maximum width & height in pixels (<width>x<height>)
-o, --out string output directory (default overwrites original)
-p, --preserve preserve file modification times (default true)
-u, --update update to latest release
-v, --version show version number
-h, --help show help
--jpegtran string jpegtran binary (default "jpegtran")
--jpegoptim string jpegoptim binary (default "jpegoptim")
--gifsicle string gifsicle binary (default "gifsicle")
--pngquant string pngquant binary (default "pngquant")
--optipng string optipng binary (default "optipng")
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```
## Examples
- `./goptimize image.png` - optimize a PNG file
- `./goptimize -m 800x800 *` - optimize and downscale all image files to a maximum size of 800x800px
- `./goptimize -m 1200x0 image.jpg` - optimize and downscale a JPG file to a maximum size of width of 1200px
- `./goptimize -o out/ image.jpg` - optimize a JPG file and save it to `out/`
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## Install
Download the appropriate binary from the [releases](https://github.com/axllent/goptimize/releases/latest), or if you have golang installed
```
go get github.com/axllent/goptimize
```
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## TODO
Some ideas for the future:
- Dry run
- Option to copy exif data (how?)