I have just been installing a couple of mosquito nets for windows in our apartment. The material is polyester, fibers are approximately 0.2mm thick, and the hexagonal "holes" apprixmately 1.5mm in diameter.
Just like the packaging says ("buy black ones if you want to have a better view"), the black ones are almost invisible from a little distance (~2 meters, its a little bit darker, almost in effect like an ND photo filter). From the same distance, the white ones are clearly visible, with good eyes you can also spot the "holes" (the effect looks almost like if you put the black point in photoshop into a much whiter area, making the contrast much less).
Why is that so? Is there a physical effect that objectively reduces the "image information" that reaches the human eye?
I would appreciate an answer that -- if applicable -- contains a short average human explanation, and additional one that goes a bit more in-depth into the "hobbyist physics" level