my company is having a big problem with getting correct size metadata by fetching PHAssets.
We have developed an iOS applications that lets customers choose pictures from library, get the size (in pixel) for each of them, calculate coordinates for adjusting to gadgets we sell, then upload high quality version of picture to our server to print gadgets.
For some of our customers, the problem is that the size in pixel of some of the high-quality versions of pictures sent, does not match pixelWidth and pixelHeight given by the PHAsset object.
To make an example, we have a picture that:

* is reported to be 2096x3724 by PHAsset object
* but, when full size image is requested, a 1536x2730 picture is generated

The picture is not in iCloud, and is sent by an iPhone 6 SE running iOS 10.2.
This is the code to get full size image version:

```
PHImageRequestOptions *imgOpts = [[PHImageRequestOptions alloc] init];
imgOpts.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
imgOpts.networkAccessAllowed = YES;
imgOpts.resizeMode = PHImageRequestOptionsResizeModeExact;
imgOpts.version = PHImageRequestOptionsVersionCurrent;  

PHCachingImageManager *imageManager = [[PHCachingImageManager alloc] init];

[imageManager requestImageForAsset:imageAsset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:imgOpts resultHandler:^(UIImage *  result, NSDictionary *  info) {
    NSData * imageData = UIImageJPEGRepresentation(result, 0.92f);
    //UPLOAD OF imageData TO SERVER HERE
}]

```

Also tried with requestImageDataForAsset method, but with no luck:

```
PHImageRequestOptions *imgOpts = [[PHImageRequestOptions alloc] init];
imgOpts.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
imgOpts.networkAccessAllowed = YES;
imgOpts.resizeMode = PHImageRequestOptionsResizeModeExact;
imgOpts.version = PHImageRequestOptionsVersionCurrent;  

PHCachingImageManager *imageManager = [[PHCachingImageManager alloc] init];

[imageManager requestImageDataForAsset:imageAsset options:imgOpts resultHandler:^(NSData * imageData, NSString * dataUTI, UIImageOrientation orientation, NSDictionary *  info) {
    //UPLOAD OF imageData TO SERVER HERE
}]

```

Getting exact size from high-resolution version of every picture, before doing upload, is not an option for us, 'cause it would degrade a lot performance when selecting a large amount of assets from the library.

Are we missing or doing something wrong? 
Is there a way to get asset size in pixel without loading full-resolution image into memory?
Thanks for helping