When diff with image file, cannot show the "Before" one

Question

When use SourceTree to diff with image file, the "Before" can only show "No Preview Available" even it has a "Before".

testmonstar01 · Answer

I use the meld or P4merge(mainly) on Mac.

https://developer.atlassian.com/blog/2015/12/tips-tools-to-solve-git-conflicts

Anas_ew0h40 · Answer

What tool do you use for that ? (on mac ? )

testmonstar01 · Answer

Not found a solution in SourceTree.

Though can use External Diff tool for a temporary solution...