使用CoreImage教程

CoreImage包含有很多實(shí)用的濾鏡,專業(yè)處理圖片的庫,為了能看到各種渲染效果,請(qǐng)使用如下圖片素材.

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現(xiàn)在可以開始教程了:

#define FIX_IMAGE(image) fixImageWidth(image, 320.f)// 固定圖片的寬度 UIImage * fixImageWidth(UIImage *image, CGFloat width) {float newHeight = image.size.height * (width / image.size.width);CGSize size = CGSizeMake(width, newHeight);UIGraphicsBeginImageContextWithOptions(size, NO, 0);CGContextRef context = UIGraphicsGetCurrentContext();CGContextTranslateCTM(context, 0.0, size.height);CGContextScaleCTM(context, 1.0, -1.0);CGContextSetBlendMode(context, kCGBlendModeCopy);CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, size.width, size.height),image.CGImage);UIImage *imageOut = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return imageOut; }代碼片段

// 將UIImage轉(zhuǎn)換成CIImageCIImage *ciImage = [[CIImage alloc] initWithImage:[UIImage imageNamed:@"1.jpg"]];// 創(chuàng)建濾鏡CIFilter *filter = [CIFilter filterWithName:@"CIPhotoEffectMono"keysAndValues:kCIInputImageKey, ciImage, nil];[filter setDefaults];// 獲取繪制上下文CIContext *context = [CIContext contextWithOptions:nil];// 渲染并輸出CIImageCIImage *outputImage = [filter outputImage];// 創(chuàng)建CGImage句柄CGImageRef cgImage = [context createCGImage:outputImagefromRect:[outputImage extent]];// 獲取圖片UIImage *showImage = [UIImage imageWithCGImage:cgImage];// 釋放CGImage句柄CGImageRelease(cgImage);// 顯示圖片UIImageView *imageView = \[[UIImageView alloc] initWithImage:FIX_IMAGE(showImage)];[self.view addSubview:imageView];代碼片段

效果如下:

我們對(duì)操作進(jìn)行簡(jiǎn)易的封裝:

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){// 將UIImage轉(zhuǎn)換成CIImageCIImage *ciImage = [[CIImage alloc] initWithImage:image];// 創(chuàng)建濾鏡CIFilter *filter = [CIFilter filterWithName:namekeysAndValues:kCIInputImageKey, ciImage, nil];[filter setDefaults];// 獲取繪制上下文CIContext *context = [CIContext contextWithOptions:nil];// 渲染并輸出CIImageCIImage *outputImage = [filter outputImage];// 創(chuàng)建CGImage句柄CGImageRef cgImage = [context createCGImage:outputImagefromRect:[outputImage extent]];_result = [UIImage imageWithCGImage:cgImage];// 釋放CGImage句柄CGImageRelease(cgImage);}return self; }@end

我們來開始嘗試其他的濾鏡效果,我們可以嘗試的至少有這些:

@"CILinearToSRGBToneCurve",
@"CIPhotoEffectChrome",
@"CIPhotoEffectFade",
@"CIPhotoEffectInstant",
@"CIPhotoEffectMono",
@"CIPhotoEffectNoir",
@"CIPhotoEffectProcess",
@"CIPhotoEffectTonal",
@"CIPhotoEffectTransfer",
@"CISRGBToneCurveToLinear",
@"CIVignetteEffect",

下面是所有渲染出來的圖片,與上面提供的濾鏡名字一一對(duì)應(yīng):

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以下效果是需要進(jìn)行一些配置才能達(dá)到的效果,這個(gè)就不開源了,你懂得:).

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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(我們剛剛用到的一些效果在這里哦)

• 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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