Last time We were talked about jpegoptim and jpegtran. Today we will talk about OptiPNG. OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM, and TIFF) to optimized PNG, and performs PNG integrity checks and corrections.
Check standard packages:
apt-get install optipng
How to use
Single file optimization
In order to optimize all the files in the images directory:
find public / images / -iname * .png -print0 | xargs -0 optipng -o7
You can read more linux guides by link https://linuxnotes.org/category/linux-how-to/