This was the first blog post here, and the idea was to share at least a couple of useful tips each week. A good one to start with:
At one point I was looking for a way to compress image files without changing their format, just reducing file size while keeping quality intact.
There are a few interesting tools for that, but the ones that felt both fast and effective were these:
I used Ubuntu 14.04 Server, but it should also work on similar systems.
For PNG files, install OptiPNG with:
sudo apt-get install optipng
Or compile it manually using these instructions.
For JPEG files, install JpegOptim with:
sudo apt-get install jpegoptim
After that, run these commands inside the folder that contains your images:
For PNG:
find . -type f -name '*.png' -exec optipng {} \;
For JPEG:
find . -type f -name '*.jpg' -exec jpegoptim --strip-all {} \;
That is it. You save storage and bandwidth without losing quality.