image size for retina display

I am reading up on image quality for retina display and I see I can load a higher quality image for -webkit-min-device-pixel-ratio: 2. But my question is how much higher? Say I have a regular image that is 800x600 72dpi - what would the retina image be? Thanks!

Solution

Double the dimensions. So in your example, it would be 1600*1200.

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