Install jpegoptim
sudo apt-get install jpegoptim
How to compress a file
jpegoptim filename.jpeg
To compress above the image from 5.6MB to around 500k.
$ jpegoptim –size=500k filename.jpeg
Compress all images at once.
jpegoptim *.JPG
Optimize PNG
sudo apt install
To optimize a PNG file, run
$ optipng -o7 file.png
-o selects the optimization level. The higher the level, the more compression trials. OptiPNG optimizes the given file in-place.
To make the file further smaller, we can remove the metadata from the PNG file by specifying –strip all:
$ optipng --strip all -o7 file.png