How are people accomplishing photo filters in iPhoneOS?

What are people using/doing to create photo filters or photoshop like effects on iPhone OS? Things like B&开发者_如何学Goamp;W, sepia, cross-processing, 'vintage' etc. I see ImageMagick can probably do this with a lot of futzing around, any other options?

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Brad Larson's GPUImage framework will be your best Option.You can get the framework from here.

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Here is another option.

http://www.binpress.com/app/photo-effects-sdk-for-ios/801

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ImageMagick was not the way, its to slow. The solution is to access the raw byte data and modify the RGB values pixel by pixel using, among other things, 5x5 matrix transforms. Here is a good place to start:

http://www.iphonedevsdk.com/forum/iphone-sdk-development/11158-share-your-image-proccessing-filter-code.html