How to convert PNG image to GIF in iPhone programmatically

Question

How to picker some pictures from the library, and convert them to a gif?

Answer 1

Check these Links

According to Apple,

Xcode automatically optimizes your PNG images using the pngcrush utility shipped with the SDK. (You’ll find the program in the iPhoneOS platform folders in /Developer. Run it from the command line with the –iphoneswitch to convert standard PNG files to iPhone- formatted ones.) For this reason,use PNG images in your iPhone apps where possible as your preferred image format.

Better prefer to use PNG's for your image requirements

For Picking Image :

http://iphone.zcentric.com/2008/08/28/using-a-uiimagepickercontroller/

http://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/CameraAndPhotoLib_TopicsForIOS/Articles/TakingPicturesAndMovies.html#//apple_ref/doc/uid/TP40010406

For Conversion : http://blog.objectgraph.com/index.php/2010/04/05/download-an-image-and-save-it-as-png-or-jpeg-in-iphone-sdk/

Hope this Helps

Answer 2

There's ImageMagick for iPhone.Check Using ImageMagick to create animated GIFs on the iPhone. Or search "ImageMagick for iphone" at Google

Answer 3

You can create a GIF using the ImageIO framework, which is part of the iOS SDK. You don't need ImageMagick or any other third-party library.

Look at this answer for code that uses ImageIO to create an animated GIF. If you don't want an animated GIF, just add a single image instead of a bunch of images.

As for picking images from the library, there are many questions about this already on stackoverflow. Just search for [iphone] pick image from library.