How to mask a UIImage so that white becomes transparent on iphone?

You could try making the starting UIImage completely transparent and then have another UIImageView behind it that is completely white.

You're going to have to get at the raw data, look for white pixels, modify the alpha of those pixels and save to a new NSData object and then convert that to a PNG. It's not difficult, but I wouldn't call it trivial.

Try something like this... CGImageRef myMaskedImage = myImage CGImage; const float whiteMask6 = { 255,255,255, 255,255,255 }; CGImageRef myColorMaskedImage = CGImageCreateWithMaskingColors(image, whiteMask); CGDataProviderRef provider; CGImageRef myPngImage = CGImageCreateWithPNGDataProvider(provider, NULL, true, kCGRenderingIntentDefault); NSDictionary *options = NSDictionary dictionaryWithObjectsAndKeys:NSNumber numberWithInt: 72, kCGImagePropertyDPIHeight, NSNumber numberWithInt: 72, kCGImagePropertyDPIWidth, nil; CGImageDestinationRef destRef = CGImageDestinationCreateWithURL ((CFURLRef)outPath, (CFStringRef)@"image. Png" , 1, NULL); CGImageDestinationAddImage(destRef, myPngImage, (CFDictionaryRef)options); CGImageDestinationFinalize(destRef); CGRelease(destRef); CGImageRelease(myColorMaskedImage); CGImageRelease(myPngImage); from the rather long winded Quartz2d Programming Guide and this mailing list message.

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