Filterstorm was designed from the ground up to meet your mobile photo editing needs. Using a uniquely crafted touch interface, Filterstorm allows for more intuitive editing than its desktop counterparts with a toolset designed for serious photography.
Retouching With a Touch

Filterstorm contains a suite of powerful tools including curves manipulation, color correction abilities, noise reduction, unsharp masking, and black and white conversion fine-tuning. It also includes the ability to apply any of the available filters by brush, or to a color range, as well as to the entire image.
While iPad processor speeds currently preclude the possibility of running a RAW workflow, Filterstorm is there to meet your JPEG editing needs. Giving your day’s shots the needed polishing has never been easier. Together, iPad’s extra portability and Filterstorm’s intuitive editing allow you to go from camera to edited image wherever you happen to be.
Editing Everything

The quickest way to get something done is the default Full Image mode. Whatever filter you choose gets applied across the board here, with pinch and flick navigation just as you’d expect on iPad. Simple, easy, and effective.
Editing by Brush

What if just your foreground is underexposed for your taste? You don’t want to brighten up the whole image. Brush mode allows you to select a brush, and apply the same set of filters to whatever area you like. Once in Brush mode, set your curves to make your foreground look good, and then brush that change on. Your background stays exposed, and everyone’s happy.
Colorful Changes

Say you took a lovely photo, but your sky got a bit blown out. It happens to the best of us; I promise I won’t tell. Luckily, no one needs to know. Head into Color Range mode, select the color range like above and change just the sky.
This app looks really good and it is Free – why not download it and give it a whirl – download