One of the last objections that people still had about using Apple Photos instead of iPhoto was that it did not have an external editor function built in. Well, as of version 3.0, this feature is now included with Apple Photos... however there are a few of things that you need to be aware of in order for you see the results of your editing back within Apple Photos. In this tutorial I will be using GIMP v2.8.22 as my external editor. Here is how...
