圖片過濾去色
-(UIImage *)changeGrayImage:(UIImage *)oldImage
{
int bitmapInfo = kCGImageAlphaNone;
int width = oldImage.size.width;
int height = oldImage.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
CGContextRef context = CGBitmapContextCreate (nil,
width,
height,
8,
0,
colorSpace,
bitmapInfo);
CGColorSpaceRelease(colorSpace);
if (context == NULL) {
return nil;
}
CGContextDrawImage(context,
CGRectMake(0, 0, width, height), oldImage.CGImage);
UIImage *grayImage = [UIImage imageWithCGImage:CGBitmapContextCreateImage(context)];
CGContextRelease(context);
return grayImage;
}
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