WPF Quirks: Image gets resized (badly) even when Stretch is set to None

The scenario is that an Image that has its Stretch property set to None still has a different size from the original image source. You check the Padding, the Margin, the VerticalAlignment and HorizontalAlignment properties, you play with the RenderOptions and SnapsToDevicePixels and nothing seems to work. You specify the Width and Height manually and the image is clipped. The problem here, believe it or not, is that the DPI setting of the image source is different from the system DPI setting.

The solution is an ugly thing:

<Image 
       Stretch="Fill" 
       Width="{Binding RelativeSource={RelativeSource Self}, Path=Source.PixelWidth}" 
       Height="{Binding RelativeSource={RelativeSource Self}, Path=Source.PixelHeight}"/>

So set the Stretch to Fill so that it doesn't fill!

Here is the discussion where I got the solution from: How do I keep an image from being stretched when Stretch="None" doesn't work?.