Goptimizer is a commandline utility written in Golang. It downscales and optimize existing images JPEG, PNG and Gif files.
Image downscaling 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):
- 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:
-gifsicle string
gifsicle binary (default "gifsicle")
-jpegoptim string
jpegoptim binary (default "jpegoptim")
-jpegtran string
jpegtran binary (default "jpegtran")
-m string
downscale to a maximum width & height in pixels (<width>x<height>)
-o string
output directory (default overwrites original)
-optipng string
optipng binary (default "optipng")
-p preserve file modification times (default true)
