iPhone sdk, unknown error?

Question

So I have an app that gets pixel data from a picture and then manipulates to change brightness levels via RGB values of each pixel.

I have these lines of code to convert a UImage to a CGImage

CGDataProviderRef dataProvider = CGImageGetDataProvider(mycgImage);
 CFDataRef imageData = CGDataProviderCopyData(dataProvider);
 void *pixels = CFDataGetBytePtr(imageData);

I keep getting an error of "_CGImageGetDataProvder", referenced from: (blah blah blah) and "_CGDataProviderCopyData", referenced from: (blah blah blah)

Can anyone tell me how to fix these errors? I've tried googling these errors...but to no avail. I think it has to do with me not importing something. Anyone got any help for me?

Answer 1

You may need to import the CoreGraphics framework, and/or the QuartzCore framework. Right click on the Frameworks group and do "Add Existing Framework".