Use Hazel with ImageOptim to process images for the web
wordius.com/use-hazel-with-imageoptim-to-automate-your-image-processing-workflow
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
All images uploaded to this site are compressed in ImageOptim free, open-source software for the Mac after being put through Photoshops Save for web routine. But I decided some time ago that that part of my workflow could be speeded up by using Hazel, a handy little utility for the Mac.