In macOS 10.13 High Sierra, Apple significantly enhanced the editing capabilities of Photos, adding tools for adjusting specific colors, fine-tuning color and contrast via curves, and even focusing an image with vignetting. But it still lacks many features found in other image editors, including applying a filter to an arbitrary portion of an image and adding text to an image. Photos also lets you send a photo to most third-party photo editors installed on your Mac. Just Control- or right-click a photo and choose Edit With > YourFavoriteImageEditor, and the photo opens in that app. Make your changes, then save as JPEG or another format Photos supports. Your saved changes then appear in Photos.
Looking for More Image Editing Power than Photos Can Provide? Photos now supports external editors
