使用CoreImage教程CoreImage包含有很多实用的滤镜,专业处理图片的库

转自:http://www.cnblogs.com/YouXianMing/p/3719056.html

使用CoreImage教程



CoreImage包含有很多实用的滤镜,专业处理图片的库,为了能看到各种渲染效果,请使用如下图片素材.



 
现在可以开始教程了:




 代码片段




 代码片段



效果如下:



我们对操作进行简易的封装:
CIFilterEffect.h + CIFilterEffect.m

//
//  CIFilterEffect.h
//  CIFilter
//
//  Created by YouXianMing on 14-5-9.
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface CIFilterEffect : NSObject

@property (nonatomic, strong, readonly) UIImage *result;

- (instancetype)initWithImage:(UIImage *)image filterName:(NSString *)name;

@end

//
//  CIFilterEffect.m
//  CIFilter
//
//  Created by YouXianMing on 14-5-9.
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import "CIFilterEffect.h"

@interface CIFilterEffect ()

@property (nonatomic, strong, readwrite) UIImage *result;

@end

@implementation CIFilterEffect

- (instancetype)initWithImage:(UIImage *)image filterName:(NSString *)name
{
self = [super init];
if (self)
{
// 将UIImage转换成CIImage
CIImage *ciImage = [[CIImage alloc] initWithImage:image];

// 创建滤镜
CIFilter *filter = [CIFilter filterWithName:name
keysAndValues:kCIInputImageKey, ciImage, nil];
[filter setDefaults];

// 获取绘制上下文
CIContext *context = [CIContext contextWithOptions:nil];

// 渲染并输出CIImage
CIImage *outputImage = [filter outputImage];

// 创建CGImage句柄
CGImageRef cgImage = [context createCGImage:outputImage
fromRect:[outputImage extent]];

_result = [UIImage imageWithCGImage:cgImage];

// 释放CGImage句柄
CGImageRelease(cgImage);
}
return self;
}

@end

我们来开始尝试其他的滤镜效果,我们可以尝试的至少有这些:
@"CILinearToSRGBToneCurve",

@"CIPhotoEffectChrome",

@"CIPhotoEffectFade",

@"CIPhotoEffectInstant",

@"CIPhotoEffectMono",

@"CIPhotoEffectNoir",

@"CIPhotoEffectProcess",

@"CIPhotoEffectTonal",

@"CIPhotoEffectTransfer",

@"CISRGBToneCurveToLinear",

@"CIVignetteEffect",



下面是所有渲染出来的图片,与上面提供的滤镜名字一一对应:

















 
以下效果是需要进行一些配置才能达到的效果,这个就不开源了,你懂得:).











 
 
福利:
Core Image Filter Reference
https://developer.apple.com/library/ios/documentation/graphicsimaging/reference/CoreImageFilterReference/Reference/reference.html

CICategoryBlur

CIBoxBlur

CIDiscBlur

CIGaussianBlur

CIMedianFilter

CIMotionBlur

CINoiseReduction

CIZoomBlur

CICategoryColorAdjustment

CIColorClamp

CIColorControls

CIColorMatrix

CIColorPolynomial

CIExposureAdjust

CIGammaAdjust

CIHueAdjust

CILinearToSRGBToneCurve

CISRGBToneCurveToLinear

CITemperatureAndTint

CIToneCurve

CIVibrance

CIWhitePointAdjust

CICategoryColorEffect(我们刚刚用到的一些效果在这里哦)

CIColorCrossPolynomial

CIColorCube

CIColorCubeWithColorSpace

CIColorInvert

CIColorMap

CIColorMonochrome

CIColorPosterize

CIFalseColor

CIMaskToAlpha

CIMaximumComponent

CIMinimumComponent

CIPhotoEffectChrome

CIPhotoEffectFade

CIPhotoEffectInstant

CIPhotoEffectMono

CIPhotoEffectNoir

CIPhotoEffectProcess

CIPhotoEffectTonal

CIPhotoEffectTransfer

CISepiaTone

CIVignette

CIVignetteEffect

CICategoryCompositeOperation

CIAdditionCompositing

CIColorBlendMode

CIColorBurnBlendMode

CIColorDodgeBlendMode

CIDarkenBlendMode

CIDifferenceBlendMode

CIExclusionBlendMode

CIHardLightBlendMode

CIHueBlendMode

CILightenBlendMode

CILuminosityBlendMode

CIMaximumCompositing

CIMinimumCompositing

CIMultiplyBlendMode

CIMultiplyCompositing

CIOverlayBlendMode

CISaturationBlendMode

CIScreenBlendMode

CISoftLightBlendMode

CISourceAtopCompositing

CISourceInCompositing

CISourceOutCompositing

CISourceOverCompositing

CICategoryDistortionEffect

CIBumpDistortion

CIBumpDistortionLinear

CICircleSplashDistortion

CICircularWrap

CIDroste

CIDisplacementDistortion

CIGlassDistortion

CIGlassLozenge

CIHoleDistortion

CILightTunnel

CIPinchDistortion

CIStretchCrop

CITorusLensDistortion

CITwirlDistortion

CIVortexDistortion

CICategoryGenerator

CICheckerboardGenerator

CIConstantColorGenerator

CILenticularHaloGenerator

CIQRCodeGenerator

CIRandomGenerator

CIStarShineGenerator

CIStripesGenerator

CISunbeamsGenerator

CICategoryGeometryAdjustment

CIAffineTransform

CICrop

CILanczosScaleTransform

CIPerspectiveTransform

CIPerspectiveTransformWithExtent

CIStraightenFilter

CICategoryGradient

CIGaussianGradient

CILinearGradient

CIRadialGradient

CISmoothLinearGradient

CICategoryHalftoneEffect

CICircularScreen

CICMYKHalftone

CIDotScreen

CIHatchedScreen

CILineScreen

CICategoryReduction

CIAreaAverage

CIAreaHistogram

CIRowAverage

CIColumnAverage

CIHistogramDisplayFilter

CIAreaMaximum

CIAreaMinimum

CIAreaMaximumAlpha

CIAreaMinimumAlpha

CICategorySharpen

CISharpenLuminance

CIUnsharpMask

CICategoryStylize

CIBlendWithAlphaMask

CIBlendWithMask

CIBloom

CIComicEffect

CIConvolution3X3

CIConvolution5X5

CIConvolution7X7

CIConvolution9Horizontal

CIConvolution9Vertical

CICrystallize

CIDepthOfField

CIEdges

CIEdgeWork

CIGloom

CIHeightFieldFromMask

CIHexagonalPixellate

CIHighlightShadowAdjust

CILineOverlay

CIPixellate

CIPointillize

CIShadedMaterial

CISpotColor

CISpotLight

CICategoryTileEffect

CIAffineClamp

CIAffineTile

CIEightfoldReflectedTile

CIFourfoldReflectedTile

CIFourfoldRotatedTile

CIFourfoldTranslatedTile

CIGlideReflectedTile

CIKaleidoscope

CIOpTile

CIParallelogramTile

CIPerspectiveTile

CISixfoldReflectedTile

CISixfoldRotatedTile

CITriangleKaleidoscope

CITriangleTile

CITwelvefoldReflectedTile

CICategoryTransition

CIBarsSwipeTransition

CICopyMachineTransition

CIDisintegrateWithMaskTransition

CIDissolveTransition

CIFlashTransition

CIModTransition

CIPageCurlTransition

CIPageCurlWithShadowTransition

CIRippleTransition

CISwipeTransition

 

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