Daily (or better monthly) Snippet

With the new Retina Display MacBook Pro and all the Macs with such an awesome display coming in the future - working with pixel based graphics is outdated. Drawing colors and gradients isn’t much of a problem - but also boring and sometimes a view needs a pattern or some noise.

Adding a subtle noise can be done very easily with a CIFilter:

CIImage *noisePattern = nil;
CIFilter *randomGenerator = [CIFilter filterWithName:@"CIColorMonochrome"];
[randomGenerator setValue: [[CIFilter filterWithName:@"CIRandomGenerator"] valueForKey:@"outputImage"] forKey:@"inputImage"];
[randomGenerator setDefaults];
noisePattern = [randomGenerator valueForKey:@"outputImage"];
[noisePattern drawAtPoint:NSZeroPoint fromRect:self.bounds operation:NSCompositeSourceOver fraction:0.04];