iphone UIImage 图片处理 灰度 反色 深棕色的代码

把开发过程中常用的代码段备份一下，下面的代码内容是关于iphone UIImage 图片处理 灰度 反色 深棕色的代码。

CGImageRef  imageRef;
imageRef = anImage.CGImage;
 
size_t width  = CGImageGetWidth(imageRef);
size_t height = CGImageGetHeight(imageRef);
 
size_t                  bitsPerComponent;
bitsPerComponent = CGImageGetBitsPerComponent(imageRef);
 
size_t                  bitsPerPixel;
bitsPerPixel = CGImageGetBitsPerPixel(imageRef);
 
size_t                  bytesPerRow;
bytesPerRow = CGImageGetBytesPerRow(imageRef);
 
CGColorSpaceRef         colorSpace;
colorSpace = CGImageGetColorSpace(imageRef);
 
CGBitmapInfo            bitmapInfo;
bitmapInfo = CGImageGetBitmapInfo(imageRef);
 
bool                    shouldInterpolate;
shouldInterpolate = CGImageGetShouldInterpolate(imageRef);
 
CGColorRenderingIntent  intent;
intent = CGImageGetRenderingIntent(imageRef);
 
CGDataProviderRef   dataProvider;
dataProvider = CGImageGetDataProvider(imageRef);
 
CFDataRef   data;
data = CGDataProviderCopyData(dataProvider);
 
NSUInteger  x, y;
for (y = 0; y < height; y++) {
    for (x = 0; x < width; x++) {
         
        UInt8 red,green,blue;
         
        UInt8 brightness;
         
        switch (type) {
                 
                break;
                 
                break;
                 
                break;
                 
            default:
                break;
        }
         
    }
}
 
CFDataRef   effectedData;
effectedData = CFDataCreate(NULL, buffer, CFDataGetLength(data));
 
CGDataProviderRef   effectedDataProvider;
effectedDataProvider = CGDataProviderCreateWithCFData(effectedData);
 
CGImageRef  effectedCgImage;
effectedCgImage = CGImageCreate(

width, height,
bitsPerComponent, bitsPerPixel, bytesPerRow,
colorSpace, bitmapInfo, effectedDataProvider,
NULL, shouldInterpolate, intent);
effectedImage = [[UIImage alloc] initWithCGImage:effectedCgImage];

CGImageRelease(effectedCgImage);
CFRelease(effectedDataProvider);
CFRelease(effectedData);
CFRelease(data);
 
return effectedImage;

}