Question: I am researching iPhone image libraries. I am looking for a lightweight image library that will compile on an iPhone. Have any libraries such as ImageMagick been ported? What image libraries would be best suited for the iPhone?

The image library should be suited to do black & white, sepia tone, saturation filters, and more sophisticated effects such as oil painting, etc.

Thank you in advance.

Answer: 
The iPhone SDK comes with a very good image library, Core Graphics. From the SDK Documentation:

> 
> The Core Graphics framework is a
>  C-based API that provides low-level,
>  lightweight 2D rendering with superb
>  output fidelity. Use this framework,
>  which is based on the Quartz drawing
>  engine, for path-based drawing,
>  anti-aliased rendering, gradients,
>  images, color management,
>  coordinate-space transformations, and
>  PDF document handling.
> 
> 
> 

Check Out: <http://developer.apple.com/iphone/library/navigation/Topics/GraphicsAnimation/index.html>

And :<http://developer.apple.com/iphone/library/navigation/Frameworks/Media/CoreGraphics/index.html>

(Login required for both).
I believe there has been some success porting ImageMagick it to iOS:

<http://www.imagemagick.org/discourse-server/viewtopic.php?f=4&t=14089>