As a retired graphic designer, I have an iMac with both Photoshop and Fireworks installed, and it's an excellent professional photo editing platform. However, I rarely bother to edit on the iMac anymore; the Snapseed and Image Size apps are more powerful than the built-in editor in my iPad's Photos app, quite flexible, and much easier to use than Photoshop. They're free in the App Store, so give them a try on your iPad, especially if you use the iPad to take the photos in the first place.