Even though they cant see very well (I dont know about the color thing) one thing a lot of guys over look is they are extreemly smart, studies say more so than dogs and over the years i have found that when hunted hard they will learn the shape and sound of a hunter. If you are in light camo standing in front of a dark background, vise versa, or make any kind of sound that they link to human, a hard hunted hog will not wait to see movement, they will just be gone.
On the other side of the coin if you get into a bunch of hogs that have not had a lot of hunting pressure you can get away with alot.