In digital image editing, color management essentially refers to a process of ensuring that image colors are displayed consistently across different screens and devices or when printed. Color management is handled automatically by Pixelmator Pro, so there isn’t much you need to do for most images you edit. However, at times, you may need to use a specific color profile when editing an image, change the color depth, or simulate what an image would look like on another device by soft proofing.
Let's take a photo captured using a digital camera, for instance. If you're shooting regular JPEG, the image is first processed by the camera's sensor, then you may want to touch it up on your computer, and finally, print it. In each step of this process, the image colors are managed a little differently, and it's rarely possible to achieve an identical color reproduction but color management simply allows better damage control in case any color changes should occur.
Pixelmator Pro does not currently support color models other than RGB during editing but you can convert your images to CMYK or grayscale using any profile installed on your Mac when exporting.
Note: RAW layers are always displayed and edited using 16-bit color depth, even in 8-bit images.