You can look at the example images in their normal forms, or the colorless forms with the sliders on the bottom left and right. advertising is uncool
I was messing around with stuff; this is one of the results. So basically the way this works is that it clones the image and sets the color to the near opposite of the normal image. The original image is put at half transparency, and the two colors contrast which makes it look grey. at least i think dont fact check it lol