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Added UIImage category to apply noise to any image
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Cory Imdieke
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Sep 13, 2012
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,16 @@ | ||
| // | ||
| // UIImage+KGNoise.h | ||
| // KGNoiseExample | ||
| // | ||
| // Created by Cory Imdieke on 9/13/12. | ||
| // Copyright (c) 2012 BitSuites, LLC. All rights reserved. | ||
| // | ||
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| #import <UIKit/UIKit.h> | ||
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| @interface UIImage (KGNoise) | ||
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| - (UIImage *)imageWithNoiseOpacity:(CGFloat)opacity; | ||
| - (UIImage *)imageWithNoiseOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMode; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // | ||
| // UIImage+KGNoise.m | ||
| // KGNoiseExample | ||
| // | ||
| // Created by Cory Imdieke on 9/13/12. | ||
| // Copyright (c) 2012 BitSuites, LLC. All rights reserved. | ||
| // | ||
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| #import "UIImage+KGNoise.h" | ||
| #import "KGNoise.h" | ||
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| @implementation UIImage (KGNoise) | ||
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| - (UIImage *)imageWithNoiseOpacity:(CGFloat)opacity{ | ||
| return [self imageWithNoiseOpacity:opacity andBlendMode:kCGBlendModeScreen]; | ||
| } | ||
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| - (UIImage *)imageWithNoiseOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMode{ | ||
| // Create a context to draw in | ||
| CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); | ||
| CGContextRef context = CGBitmapContextCreate(NULL, | ||
| self.size.width, | ||
| self.size.height, | ||
| 8, /* bits per channel */ | ||
| (self.size.width * 4), /* 4 channels per pixel * numPixels/row */ | ||
| colorSpace, | ||
| kCGImageAlphaPremultipliedLast); | ||
| CGColorSpaceRelease(colorSpace); | ||
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| // Flip context | ||
| CGContextTranslateCTM(context, 0, self.size.height); | ||
| CGContextScaleCTM(context, 1.0, -1.0); | ||
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| UIGraphicsPushContext(context); | ||
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| // Draw the image | ||
| [self drawAtPoint:CGPointMake(0.0, 0.0)]; | ||
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| // Noise on top | ||
| [KGNoise drawNoiseWithOpacity:opacity andBlendMode:blendMode]; | ||
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| // Create a CGImage from the context | ||
| CGImageRef rawImage = CGBitmapContextCreateImage(context); | ||
| UIGraphicsPopContext(); | ||
| CGContextRelease(context); | ||
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| // Create a UIImage from the CGImage | ||
| UIImage *finishedImage = [UIImage imageWithCGImage:rawImage]; | ||
| CGImageRelease(rawImage); | ||
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| return finishedImage; | ||
| } | ||
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| @end |