- Open ColorSync Utility app
- Open Filters tab
- Duplicate Reduce File Size filter
- Customize a duplicated filter:
- Image Sampling -> Set Resolution:
300
Pixels/Inch - Image Compression -> Quality:
50%
References: https://apple.stackexchange.com/a/354553
300
Pixels/Inch50%
References: https://apple.stackexchange.com/a/354553