To apply a new ColorSync profile to a document:

Choose Tools > Assign Profile.

Select a ColorSync profile.
You can choose the ColorSync profile used for an image, so that its colors are more faithfully reproduced on printers, displays, and other devices.
Choose Tools > Assign Profile.
Select a ColorSync profile.
The image saved in the file is not modified; only the ColorSync profile for the image is changed. To change the image, choose Tools > “Match to Profile.”