It's quite common to see web pages that show a solid color in place of images, while resources are being loaded. The color is usually averaged from the original image, as to give it a more "consistent" feeling while the page loads.
A simple way to do this from the command line is by using ImageMagick to resize the image to 1x1 size, then get the color of that one pixel:
% convert pic.jpg -resize '1x1!' txt:- # ImageMagick pixel enumeration: 1,1,65535,srgb 0,0: (16818.3,27417.8,39342.8) #416B99 srgb(65,107,153)
(The image ...
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