You also need to fine-tune your great photos in addition to adding various effects? Check out Snapseed, the photo app should be able to meet your requirements.
Snapseed is a versatile photo app developed by Nik Software, and designed for both iPhone and iPad. The universal app features easy-to-use user interface and many adjustment and improvement options, so you can use the photo editor to fine-tune your photos with your finger, including making precise selections and enhancements to specific areas of your photos, adjusting white balance, saturation and contract, rotating or cropping photos, and more. You can also import the photo in photo library for further adjustment. And the photo app also comes with many beautiful photo effects such as black & white, vintage films, drama and grunge, so the photo app also allows you to create awesome creative photos. BTW, don’t forget to share your works with friends via Facebook and Flickr.
Snapseed with a size of 15 MB is compatible with iPhone, iPod touch and iPad running iOS 4.2 or later. At present, the universal app is free for a limited time. If you’re interested, jump to App Store for more details.