A simple image optimization library for hexo. It works with imagemagick therefore you'll need it to run this.
For Mac OS X, it's as simple as running:
brew install imagemagick
Info for other systems can be found here: ImageMagick.
npm i --save hexo-img-optimization
After the installation is complete, simply:
hexo generate && hexo img
Hexo img will run through your public directory, find all .jpg/.jpeg/.png files and proccess them with imagemagick. It can also optionally make thumbnails if you provide that option in config.yml The exact image modifications can be changed via _config.yml:
img_optimization: # root of configuration for image optimization exclude: # exclude takes an array of file names or directories to ignore from the public folder. Defaults to no exclusions. - css/ # anything that ends with a forward slash will be considered a directory - fancybox/ - banner.jpg # anything else is a file jpg: enabled: true # if false, jpgs will get ignored. Defaults to true params: -resize 760000@ # parameter string to pass to imagemagick's convert function png: # jpg/png/jpeg all have the same fields and can be configured independently enabled: false thumb: -resize 680x680> -strip -quality 82 -alpha Remove jpeg: enabled: false # these parameters will be used for any file types that do not have a params parameter defined in config. You can override these to your own preferred defaults. default_params: -resize 760000@ -filter Triangle -define filter:support=2 -unsharp 0.25x0.25+8+0.065 -dither None -posterize 136 -quality 85 -define jpeg:fancy-upsampling=off -interlace none -colorspace sRGB -strip -define png:compression-filter=5 -define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude-chunk=all default_thumb: -resize 680x680> -sampling-factor 4:2:0 -strip -quality 85 -interlace JPEG -colorspace RGB
Under no means is the default parameter setup optimal. Please experiment and find what works for you.
Take note that under default configuration hexo-img-optimization will touch all your images and change them, therefore a good starting point for hexo would be the following:
img_optimization: exclude: - css/ - fancybox/
The idea was born when hosting hexo in s3, where I'd like to deploy modified images in order to speed up the blog loading speed.