UIImage:去色功能的实现（图片灰色显示）

来源：互联网发布：巨人网络财务报表编辑：程序博客网时间：2024/06/09 22:45

代码如下：

-(UIImage *)grayImage:(UIImage *)sourceImage{    int bitmapInfo = kCGImageAlphaNone;    int width = sourceImage.size.width;    int height = sourceImage.size.height;    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();    CGContextRef context = CGBitmapContextCreate (nil,                                                  width,                                                  height,                                                  8,      // bits per component                                                  0,                                                  colorSpace,                                                  bitmapInfo);    CGColorSpaceRelease(colorSpace);    if (context == NULL) {        return nil;    }    CGContextDrawImage(context,                       CGRectMake(0, 0, width, height), sourceImage.CGImage);    UIImage *grayImage = [UIImage imageWithCGImage:CGBitmapContextCreateImage(context)];    CGContextRelease(context);    return grayImage;}

本文转自：http://www.cocoachina.com/bbs/read.php?tid=178396

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