Don't mean to pick a fight here, Jairus, but in reality, the further away objects are to the viewer, the LIGHTER (and less distinct/contrasty) they become. In order to achieve the illusion of depth, objects that are supposed to be far away should be rendered progressively lighter and fainter as they recede into the background, not darker/more contrasty.
Like I said...if you have an available view, look to the horizon. The far distant objects (trees, mountains, buildings, whatever) will appear lighter and less contrasty the further away from you they are.
An example: look at any photo of a mountainscape. The hills furthest away from the viewer will appear much lighter and fainter that those closer in. The impurities in the air cause this effect. The further away an object is from the viewer, the more airborne "stuff" between that object and your eyes...causing that far away object to appear lighter and fainter than those objects closer to you. The only place you wouldn't have this effect is in an airless environment...like the moon, for instance.
(Sorry to "lecture"...but I didn't pay thousands of dollars for that college education for nothin"!) :wink: