一般用imagePickerController获取到dic以后常用的方法是使用
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UIImage *image = [dic objectForKey:@"UIImagePickerControllerOriginalImage"];
来获取原图，但是我使用这个方法获取到得图片并不是原图，而是尺寸经过压缩后的，后来找到了一个新的方法来进行获取 直接贴代码
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- ALAssetsLibrary?*library?=?[[ALAssetsLibrary?alloc]?init];??
- ?????[library?assetForURL:[dic?objectForKey:UIImagePickerControllerReferenceURL]??
- ??????????????resultBlock:^(ALAsset?*asset)??
- ??????{??
- ??????????ALAssetRepresentation?*representation?=?[asset?defaultRepresentation];??
- ??????????CGImageRef?imgRef?=?[representation?fullResolutionImage];??
- ??????????UIImage?*image?=?[UIImage?imageWithCGImage:imgRef??
- ?????????????????????????????????????????????scale:representation.scale??
- ???????????????????????????????????????orientation:(UIImageOrientation)representation.orientation];??
- ??????????NSData?*?data?=?UIImageJPEGRepresentation(image,?0.5);??????????????????
- ??
- ??????}failureBlock:^(NSError?*error){??
- ??????????NSLog(@"couldn‘t?get?asset:?%@",?error);??
- ??????}??
- ??????];??
