灰度bitmap转换为UIimage

- (UIImage *)imageFromGrayBytes:(unsigned char *)imageBytes imageSize:(CGSize)imageSize {

    CGImageRef imageRef = [self imageRefFromGrayBytes:imageBytes imageSize:imageSize];

    UIImage *image = [UIImage imageWithCGImage:imageRef];

    CGImageRelease(imageRef);

    return image;

    

}

 

 

 

- (CGImageRef)imageRefFromGrayBytes:(unsigned char *)imageBytes imageSize:(CGSize)imageSize {

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();

    CGContextRef context = CGBitmapContextCreate(imageBytes,imageSize.width,imageSize.height,8,imageSize.width ,colorSpace, kCGImageAlphaNone);

    CGImageRef imageRef = CGBitmapContextCreateImage(context);

    CGContextRelease(context);

    CGColorSpaceRelease(colorSpace);

    return imageRef;

    

}