The Photos app saves disk space on your Mac by displaying optimized JPEG versions of your RAW images. If you have the Optimize Mac Storage option turned on, then your RAW files are stored in iCloud Photos.See the image below - courtesy of Digital Photography School - to get an idea of the differences. RAW files have a higher dynamic range than JPEG files.The RAW format contains 68 billion more colors than JPEG files.RAW has a higher brightness level than JPEG.Your camera is capturing absolutely all the data it receives from the camera’s sensor so you have more data to work with.The benefits - as noted by Format magazine are: Software like Photos allows you to view the data as images and edit the RAW files. Unlike a JPEG file, RAW format is uncompressed and isn’t actually an image file, but is a collection of data from your camera’s sensor that are saved on your camera. This means they take up less storage space than RAW files. Of course, keep in mind that files in the JPEG format, the standard file format in the digital photography world, are stored as compressed files.
For some folks, working with the RAW format offers several benefits. You can edit photos in a variety of formats with the macOS Photos app.
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