Hitting 'Save As' used to be a recipe for disaster, but recently I've found that hitting 'Save As' and saving a TIFF, Photoshop or Large Document Format file works, even if you change the file name.

I’ll never admit it, but I don’t know everything about Photoshop. And in an app that can’t offer the usual tooltips when you hover over an unfamiliar icon, Photoshop for iPhone has am slight learning ...

The TIFF, PNG and WebP graphics formats support ... Layered graphics formats such as Photoshop's native PSD format can have many alpha channels while the image is being composed.