git visual diff between branches

Question

This answer is great for seeing a visual diff between two files that are checked into git: How do I view 'git diff' output with a visual diff program?

Howev

Answer 1

You can also do this easily with gitk.

> gitk branch1 branch2

First click on the tip of branch1. Now right-click on the tip of branch2 and select Diff this->selected.