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

使用CoreImage教程

CoreImage包含有很多實用的濾鏡,專業處理圖片的庫,為了能看到各種渲染效果,請使用如下圖片素材.

現在可以開始教程了:

效果如下:

我們對操作進行簡易的封裝:

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轉換成CIImage        CIImage *ciImage = [[CIImage alloc] initWithImage:image];                // 創建濾鏡        CIFilter *filter = [CIFilter filterWithName:name                                      keysAndValues:kCIInputImageKey, ciImage, nil];        [filter setDefaults];                // 獲取繪制上下文        CIContext *context = [CIContext contextWithOptions:nil];                // 渲染并輸出CIImage        CIImage *outputImage = [filter outputImage];                // 創建CGImage句柄        CGImageRef cgImage = [context createCGImage:outputImage                                           fromRect:[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應:
 
以下效果是需要進行一些配置才能達到的效果,這個就不開源了,你懂得:).
 
 
福利:
Core Image Filter Reference
https://developer.apple.com/library/ios/documentation/graphicsimaging/reference/CoreImageFilterReference/Reference/reference.html
CICategoryBlur
CIBoxBlurCIDiscBlurCIGaussianBlurCIMedianFilterCIMotionBlurCINoiseReductionCIZoomBlur
CICategoryColorAdjustment
CIColorClampCIColorControlsCIColorMatrixCIColorPolynomialCIExposureAdjustCIGammaAdjustCIHueAdjustCILinearToSRGBToneCurveCISRGBToneCurveToLinearCITemperatureAndTintCIToneCurveCIVibranceCIWhitePointAdjust
CICategoryColorEffect(我們剛剛用到的一些效果在這里哦)
CIColorCrossPolynomialCIColorCubeCIColorCubeWithColorSpaceCIColorInvertCIColorMapCIColorMonochromeCIColorPosterizeCIFalseColorCIMaskToAlphaCIMaximumComponentCIMinimumComponentCIPhotoEffectChromeCIPhotoEffectFadeCIPhotoEffectInstantCIPhotoEffectMonoCIPhotoEffectNoirCIPhotoEffectProcessCIPhotoEffectTonalCIPhotoEffectTransferCISepiaToneCIVignetteCIVignetteEffect
CICategoryCompositeOperation
CIAdditionCompositingCIColorBlendModeCIColorBurnBlendModeCIColorDodgeBlendModeCIDarkenBlendModeCIDifferenceBlendModeCIExclusionBlendModeCIHardLightBlendModeCIHueBlendModeCILightenBlendModeCILuminosityBlendModeCIMaximumCompositingCIMinimumCompositingCIMultiplyBlendModeCIMultiplyCompositingCIOverlayBlendModeCISaturationBlendModeCIScreenBlendModeCISoftLightBlendModeCISourceAtopCompositingCISourceInCompositingCISourceOutCompositingCISourceOverCompositing
CICategoryDistortionEffect
CIBumpDistortionCIBumpDistortionLinearCICircleSplashDistortionCICircularWrapCIDrosteCIDisplacementDistortionCIGlassDistortionCIGlassLozengeCIHoleDistortionCILightTunnelCIPinchDistortionCIStretchCropCITorusLensDistortionCITwirlDistortionCIVortexDistortion
CICategoryGenerator
CICheckerboardGeneratorCIConstantColorGeneratorCILenticularHaloGeneratorCIQRCodeGeneratorCIRandomGeneratorCIStarShineGeneratorCIStripesGeneratorCISunbeamsGenerator
CICategoryGeometryAdjustment
CIAffineTransformCICropCILanczosScaleTransformCIPerspectiveTransformCIPerspectiveTransformWithExtentCIStraightenFilter
CICategoryGradient
CIGaussianGradientCILinearGradientCIRadialGradientCISmoothLinearGradient
CICategoryHalftoneEffect
CICircularScreenCICMYKHalftoneCIDotScreenCIHatchedScreenCILineScreen
CICategoryReduction
CIAreaAverageCIAreaHistogramCIRowAverageCIColumnAverageCIHistogramDisplayFilterCIAreaMaximumCIAreaMinimumCIAreaMaximumAlphaCIAreaMinimumAlpha
CICategorySharpen
CISharpenLuminanceCIUnsharpMask
CICategoryStylize
CIBlendWithAlphaMaskCIBlendWithMaskCIBloomCIComicEffectCIConvolution3X3CIConvolution5X5CIConvolution7X7CIConvolution9HorizontalCIConvolution9VerticalCICrystallizeCIDepthOfFieldCIEdgesCIEdgeWorkCIGloomCIHeightFieldFromMaskCIHexagonalPixellateCIHighlightShadowAdjustCILineOverlayCIPixellateCIPointillizeCIShadedMaterialCISpotColorCISpotLight
CICategoryTileEffect
CIAffineClampCIAffineTileCIEightfoldReflectedTileCIFourfoldReflectedTileCIFourfoldRotatedTileCIFourfoldTranslatedTileCIGlideReflectedTileCIKaleidoscopeCIOpTileCIParallelogramTileCIPerspectiveTileCISixfoldReflectedTileCISixfoldRotatedTileCITriangleKaleidoscopeCITriangleTileCITwelvefoldReflectedTile
CICategoryTransition
CIBarsswipeTransitionCICopyMachineTransitionCIDisintegrateWithMaskTransitionCIDissolveTransitionCIFlashTransitionCIModTransitionCIPageCurlTransitionCIPageCurlWithShadowTransitionCIRippleTransitionCISwipeTransition
 
標簽: iOS