The iPhone and iPad have really pushed developers to have more and better features for editing photos on mobile devices. I've used and been impressed with apps like Photoforge, PhotoStudio, PhotoWizard and more.
Today I've been using and testing Luminance, which adds some clever functions for serious iOS photographers. First and foremost is the ability to add layers of adjustments to photos. While not the first app to do this, it's intuitive to add effects as layers, which can be removed or
