File talk:Bergtocht van parkeerplaats bij centrale Malga Mare naar Lago Lungo. Uitzicht op Monte Cevedale.jpg
See File:Eyesensitivity.svg and en:Luminosity_function: The "simple" grayscale did not take eye sensitivity into account. I fixed this using GIMP and the original image at File:Bergtocht van parkeerplaats bij centrale Malga Mare naar Lago Lungo. Uitzicht op Monte Cevedale 05.jpg
To verify that this is correct, you can open the old version and the color image, both in full screen, and switch between the images. You'll notice a strange difference. With the new version, the difference is gone.
To create such a "perfect" grayscale yourself, you can use a tool like GIMP (or Photoshop, because Photoshop likely does it correct as well), select "Desaturate" and the "Luminosity" algorithm. 
Additional notes: https://docs.gimp.org/en/gimp-tool-desaturate.html , Luminosity = 0.21×R + 0.72×G + 0.07×B
