Let assume for a moment that the background color of the webpage is grey, so that you have both the option of a black or a white border around your images.
For color, I still like the a black border (a holdover from the first article I read about putting images on the web from Philip Greenspun in 1994 ?). However, for black and white, a white border looks a bit better. Maybe because a color image is a window on the world, whereas a black and white image is a print hung on a wall ? Or maybe because there are often pure blacks, but no pure whites ? Let's hearing about your preferences and arguments.
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