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    <p>I can get results very close to the tint in the Apple navigation bar by using kCGBlendModeOverlay. Taking excelent @fabb answer and combining @omz approach in this post <a href="https://stackoverflow.com/a/4684876/229019">https://stackoverflow.com/a/4684876/229019</a> I came with this solution that helds the results I was expecting:</p> <pre><code>- (UIImage *)tintedImageUsingColor:(UIColor *)tintColor; { UIGraphicsBeginImageContextWithOptions (self.size, NO, [[UIScreen mainScreen] scale]); CGContextRef context = UIGraphicsGetCurrentContext(); CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height); // draw original image [self drawInRect:rect blendMode:kCGBlendModeNormal alpha:1.0f]; // tint image (loosing alpha). // kCGBlendModeOverlay is the closest I was able to match the // actual process used by apple in navigation bar CGContextSetBlendMode(context, kCGBlendModeOverlay); [tintColor setFill]; CGContextFillRect(context, rect); // mask by alpha values of original image [self drawInRect:rect blendMode:kCGBlendModeDestinationIn alpha:1.0f]; UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return tintedImage; } </code></pre> <p>Here's an example tinting several grayscale images with transparency:</p> <p><img src="https://i.stack.imgur.com/3MADR.png" alt="Rendered Example">: </p> <ul> <li>The first line is the apple toolbar tinted [UIColor orangeColor]. </li> <li>The second line is the same gradient tinted in several colors starting with clear color (= the actual gradient) and ending with the same orange. </li> <li>The third is a simple circle with transparency (the linen is the background color)</li> <li>The forth line is a complex dark noisy texture</li> </ul>
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    1. POHow to tint a transparent PNG image in iPhone?
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    1. COThis worked great for me. I would just add that changing the first line to: UIGraphicsBeginImageContextWithOptions (self.size, NO, [[UIScreen mainScreen] scale]); allowed the image to retain a retina formatting, if applicable.
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