I applied a checkerboard grid to the sample photo, where each checkerboard square corresponds to one pixel of the photo. After applying this grid, the white areas of the checkerboard squares are the original photo pixels, and the black areas are inverted in both color and brightness. The full-size photo thus appears as a gray monochrome area, but the original photo is displayed only after digital zooming. For correct display on a Full HD monitor, the photo must be approximately 2000 px in height. Incorrect display may occur when opening the photo in a browser that bicubically resamples the pixel grid. A verified browser is, for example, Windows Photo Viewer.
As another example of this principle in action, I created a photograph that features both color and semantic contrast.