To do Alt + J + P on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by J, then P.
Command: Picture Format Tab
This is how to do Alt + J + P on Mac in PowerPoint with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with PowerPoint.
Alt + J + P switches to the Picture Format tab in PowerPoint. This contextual tab appears when you have a picture selected and provides access to picture adjustment, styling, and formatting tools.