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I’d like to create a Fisheye effect shown in many IOS Apps and some other interesting effects like color burn and so on …
Which is the best way to work on these features ? Could you suggest me some useful links or code ?
I need understand in which direction i have to go to work on graphic effects that take an image as input and obtain a modified result of that as output.
Thank you.
It depends of how far you decide to go. Some simple effects you can make with Quartz (native iOS/MacOSX graphic subsystem). For 2d game developement, use cocos2d-iphone. It has lens effect and burning flame and many other interesting effects. Some demos.
For advanced graphical effects, learn OpenGL ES. Official site