Photo Editor for Android with a lot of filters and tools (brightness, contrast, saturation, …). Very easy usage and a very singular feature: This app implements every tool with the possibility of applying adjustments to all the picture or only to a SELECTION. How to select? The easiest way! Finger painting! Just draw over the areas you want to edit, blur if you want to spread the selection and finally apply changes ONLY to the selected area.
Get it on Google Play: