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1) If you are working with bundles go to bundle target and set COMBINE_HIDPI_IMAGES to NO. In another case the image will be converted to tiff format.
2) try this code:
NSBundle *bundle = [NSBundle bundleWithURL:[[NSBundle mainBundle] URLForResource:@"YourBundle" withExtension:@"bundle"]];
NSString *imagePath = [bundle pathForResource:@"imageInBundle" ofType:@"png"];
UIImage *image = [UIImage imageWithContentsOfFile:imagePath];