Optimise your screenshots on Mac using Automator and ImageOptim.
The workflow watches a custom screenshot directory for changes and passes the files to ImageOptim. On completion a notification toast will appear.
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Download and install ImageOptim https://imageoptim.com/mac
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Set your default screenshot directory to something other than your desktop
mkdir ~/Documents/Screenshots && defaults write com.apple.screencapture location $_ && killall SystemUIServer
- Download, extract, and import the 'Optimise Screenshots.zip' workflow into Automator https://github.com/omgaz/image-optim-screenshots/blob/master/Optimise Screenshots.zip