iOS处理图片颜色代码

概述iOS处理图片颜色代码

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处理图片颜色- (UIImage*)grayscale:(UIImage*)anImage type:(int)type{    CGImageRef imageRef = anImage.CGImage;    size_t wIDth  = CGImageGetWIDth(imageRef);    size_t height = CGImageGetHeight(imageRef);    size_t bitsPerComponent = CGImageGetBitsPerComponent(imageRef);    size_t bitsPerPixel = CGImageGetBitsPerPixel(imageRef);    size_t bytesPerRow = CGImageGetBytesPerRow(imageRef);    CGcolorSpaceRef colorSpace = CGImageGetcolorSpace(imageRef);    CGBitmAPInfo bitmAPInfo = CGImageGetBitmAPInfo(imageRef);    bool shouldInterpolate = CGImageGetShouldInterpolate(imageRef);    CGcolorRenderingIntent intent = CGImageGetRenderingIntent(imageRef);    CGDataProvIDerRef dataProvIDer = CGImageGetDataProvIDer(imageRef);    CFDataRef data = CGDataProvIDercopyData(dataProvIDer);    UInt8 *buffer = (UInt8*)CFDataGetBytePtr(data);    NSUInteger  x,y;    for (y = 0; y < height; y++) {        for (x = 0; x < wIDth; x++) {            UInt8 *tmp;            tmp = buffer + y * bytesPerRow + x * 4;            UInt8 red,green,blue;            red = *(tmp + 0);            green = *(tmp + 1);            blue = *(tmp + 2);            UInt8 brightness;                         switch (type) {                case 1:                    brightness = (77 * red + 28 * green + 151 * blue) / 256;                    *(tmp + 0) = brightness;                    *(tmp + 1) = brightness;                    *(tmp + 2) = brightness;                    break;                case 2:                    *(tmp + 0) = red;                    *(tmp + 1) = green * 0.7;                    *(tmp + 2) = blue * 0.4;                    break;                case 3:                    *(tmp + 0) = 255 - red;                    *(tmp + 1) = 255 - green;                    *(tmp + 2) = 255 - blue;                    break;                default:                    *(tmp + 0) = red;                    *(tmp + 1) = green;                    *(tmp + 2) = blue;                    break;            }         }    }    CFDataRef effectedData = CFDataCreate(NulL,buffer,CFDataGetLength(data));    CGDataProvIDerRef effectedDataProvIDer = CGDataProvIDerCreateWithCFData(effectedData);    CGImageRef effectedCgImage = CGImageCreate(                                               wIDth,height,bitsPerComponent,bitsPerPixel,bytesPerRow,colorSpace,bitmAPInfo,effectedDataProvIDer,NulL,shouldInterpolate,intent);    UIImage *effectedImage = [[UIImage alloc] initWithCGImage:effectedCgImage];    CGImageRelease(effectedCgImage);    CFRelease(effectedDataProvIDer);    CFRelease(effectedData);    CFRelease(data);    return effectedImage;}

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