How Does Google Analytics Register Direct Image Visits?

Quick headscratcher this one - on a wordpress blog I'm looking at in my top content report I see visits to an image:


This image has been posted to reddit and has received lots of traffic from there which is why it stood out. My question though, how are these visits being tracked in analytics? There's no javascript being called on the page since the page just consists of the image?

Is the google analytics plugin doing a server side google analytics call? It's possible but I think unlikely.

Am I being dumb? Anyone else seen this?

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