iOS 几个图片图像处理

来源：互联网发布：淘宝怎么删除评价编辑：程序博客网时间：2024/05/21 21:47

1、黑白化

if (红色>120 || 绿色>120 ||蓝>120 ){

变成黑色

}

else{

变成白色

}

- (UIImage *)whiteBlackImage{    CGImageRef imImage = self.CGImage;    CFDataRef mDataRef = CGDataProviderCopyData(CGImageGetDataProvider(imImage));    UInt8 *mPixelBuf = (UInt8 *)CFDataGetBytePtr(mDataRef);    CFIndex length = CFDataGetLength(mDataRef);        for(int i=0;i<length;i+=4){        int r = i;        int g = i+1;        int b = i+2;                int red1   = mPixelBuf[r];        int green1 = mPixelBuf[g];        int blue1  = mPixelBuf[b];        if (red1 < 120 || green1 < 120 || blue1 < 120) {            mPixelBuf[r] = 0;            mPixelBuf[g] = 0;            mPixelBuf[b] = 0;        }        else{            mPixelBuf[r] = 255;            mPixelBuf[g] = 255;            mPixelBuf[b] = 255;        }    }        CGContextRef ctx = CGBitmapContextCreate(mPixelBuf,                                             CGImageGetWidth(imImage),                                             CGImageGetHeight(imImage),                                             CGImageGetBitsPerComponent(imImage),                                             CGImageGetBytesPerRow(imImage),                                             CGImageGetColorSpace(imImage),                                             CGImageGetBitmapInfo(imImage)                                             );        CGImageRef imageRef = CGBitmapContextCreateImage(ctx);    CGContextRelease(ctx);    UIImage *finalImage = [UIImage imageWithCGImage:imageRef];    CGImageRelease(imageRef);    CFRelease(mDataRef);    return finalImage;}

2、海报化

素像点颜色红绿蓝都乘以Oxe0

/** *  海报化 */- (UIImage *)CBMPImage{    CGImageRef imImage = self.CGImage;    CFDataRef mDataRef = CGDataProviderCopyData(CGImageGetDataProvider(imImage));    UInt8 *mPixelBuf = (UInt8 *)CFDataGetBytePtr(mDataRef);    CFIndex length = CFDataGetLength(mDataRef);        for(int i=0;i<length;i+=4){        int r = i;        int g = i+1;        int b = i+2;                int red1   = mPixelBuf[r];        int green1 = mPixelBuf[g];        int blue1  = mPixelBuf[b];                mPixelBuf[r] = red1&0xe0;        mPixelBuf[g] = green1&0xe0;        mPixelBuf[b] = blue1&0xe0;    }            CGContextRef ctx = CGBitmapContextCreate(mPixelBuf,                                             CGImageGetWidth(imImage),                                             CGImageGetHeight(imImage),                                             CGImageGetBitsPerComponent(imImage),                                             CGImageGetBytesPerRow(imImage),                                             CGImageGetColorSpace(imImage),                                             CGImageGetBitmapInfo(imImage)                                             );        CGImageRef imageRef = CGBitmapContextCreateImage(ctx);    CGContextRelease(ctx);    UIImage *finalImage = [UIImage imageWithCGImage:imageRef];    CGImageRelease(imageRef);    CFRelease(mDataRef);    return finalImage;}

三、高斯模糊

/** *  高斯模糊 */- (UIImage *)GaussianSmoothImage{    CGImageRef imImage = self.CGImage;    CFDataRef mDataRef = CGDataProviderCopyData(CGImageGetDataProvider(imImage));    CFDataRef m_OutDataRef = CGDataProviderCopyData(CGImageGetDataProvider(imImage));    UInt8 *mPixelBuf = (UInt8 *)CFDataGetBytePtr(mDataRef);    UInt8 *mOutPixelBuf = (UInt8 *) CFDataGetBytePtr(m_OutDataRef);    //CFIndex length = CFDataGetLength(mDataRef);        int width  = (int)CGImageGetWidth(imImage);    int height = (int)CGImageGetHeight(imImage);    int templates[25] = {        1, 4,  7,  4,  1,        4, 16, 26, 16, 4,        7, 26, 41, 26, 7,        4, 16, 26, 16, 4,        1, 4,  7,  4,  1 };    int rSum,gSum,bSum;    int index=0;    for(int i= 2;i<height-2;i++){        for(int j= 2;j<width-2;j++){            rSum=0;            gSum=0;            bSum=0;            index=0;            for(int zi=i-2;zi<i+3;zi++){                for(int zj=j-2;zj<j+3;zj++){                    int s = templates[index++];                    int tindex = zi*height*4+zj*4;                    rSum += mPixelBuf[tindex]*s;                    gSum += mPixelBuf[tindex+1]*s;                    bSum += mPixelBuf[tindex+2]*s;                }            }            rSum/=273;            gSum/=273;            bSum/=273;            rSum = rSum>255?255:rSum;            gSum = gSum>255?255:gSum;            bSum = bSum>255?255:bSum;            index = i*4*width+j*4;            mOutPixelBuf[index]=rSum;            mOutPixelBuf[index+1]=gSum;            mOutPixelBuf[index+2]=bSum;        }    }        CGContextRef ctx = CGBitmapContextCreate(mOutPixelBuf,                                             CGImageGetWidth(imImage),                                             CGImageGetHeight(imImage),                                             CGImageGetBitsPerComponent(imImage),                                             CGImageGetBytesPerRow(imImage),                                             CGImageGetColorSpace(imImage),                                             CGImageGetBitmapInfo(imImage)                                             );        CGImageRef imageRef = CGBitmapContextCreateImage(ctx);    CGContextRelease(ctx);    UIImage *finalImage = [UIImage imageWithCGImage:imageRef];    CGImageRelease(imageRef);    CFRelease(mDataRef);    return finalImage;}

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