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I have a 3200 x 1600, 276 ppi display, and I have noticed that images do not appear not be the same size across applications. What could be the cause of this? In the picture below, I have opened the same image in Windows Photo Viewer, Photoshop, Firefox, and Chrome.
Edit:
It turns out that I had my display at 200%. This was the result when I switched it to 100%:
That still doesn't explain the initial discrepancy though.