Value of 0 means most compressed and 100 means lossless. Here, the formatOptions argument sets output quality for the image. This command will convert images to heic and put converted images to 'converted' folder. for i in *.jpg do sips -s format heic -s formatOptions 75 $i -out converted/$i.heic done HEIC images will be 30-50% smaller for same quality as JPEG.

It's also possible to convert all jpeg images to HEIC to save space before storing them. You can use free software and convert one file at a time, or buy. This command does not take multiple inputs but it's super easy to convert multiple files with shell scripting: for i in *.png do sips -s format jpeg $i -out Converted/$i.jpeg done It supports following conversions: canon raw cr2 to jpeg, canon raw crw to jpeg, canon raw dng to jpeg and canon raw rw2 to jpeg. To convert single file with sips, here is command syntax: sips -s format -out įor example if you want to convert file named test.png, here is sips syntax: sips -s format jpeg test.png -out test.jpg There is however a very handy command line utility called sips that comes built-in macOS and provides an easy way to convert thounsands of images in efficient manner. Opening thousands of images and then converting them using preview will mostly end up hanging mac for saveral minutes. This becomes a problem if you ever want to convert large number of images. This article by MacRumors describes an easy way to achieve it. MacOS preview application provides a very easy way to convert and process images if you want a quick way to convert a few images.

Cr3 to jpg converter mac