<img src="www.mywebsite.com/img/1.jpg" width="32px" height="32px"/>
Will return 32px even though the image might be 900px x 900px. This approach will only work if you do not put the size inside the image.
One solution to this is to run the code on the server. This will provide the actual dimensions. From there you can actually continue processing it or return a message that it needs to be the right size.
//Put the uploaded image into an image object
Dim UploadedImage as System.Drawing.Image = System.Drawing.Image.FromStream(UploadedFile.PostedFile.InputStream)
//Capture the width and height of uploaded image
Dim UploadedImageWidth as float = UploadedImage.PhysicalDimension.Width
Dim UploadedImageHeight as float = UploadedImage.PhysicalDimension.Height
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