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This is really interesting. They colorized a photo by overlaying some lines in a grid and ONLY adding color to the lines but over-saturating the color. The rest of the image is black and white.
The result is that at a distance or in the thumbnail it just looks like an ordinary color photo. It is only when you look up close you notice what is going on.
@aexiruch as is it isnt really useful for compression. That said the idea in general is used in already well established compression approaches. This is nothing novel in the general case.
I remember we were doing this sort of "cheap" compression (if you can even call it that) back in the early 90s. You basically just assign less resolution to different parts of the color encoding for example saturation vs luminescence.
