Humans have trichromatic vision. Deer, Elk (wapiti) and some other animals have dichromatic vision. It's not that deer and Elk can't "see" oranges and reds, they just perceive them differently.
Here is an explanation from Polk County Iowa
Deer Color Blindness
Are deer are color-blind? Is this why hunters can wear bright orange
clothing and the ...
I can't take any credit for already knowing this, all my information comes from an article from Penn State University, entitled Deer-Forest Study: The eyes have it!
Some of the information in this article appears to contradict the claim at first glance, for example it begins with "Day or night, a deer’s vision is excellent. This is good if you’re a deer but ...
TLDR: No, they were found all over North America before the Europeans arrived and are being reintroduced into the Appalachian mountains. I can see them preferring the plains instead of mountains in the absence of hunting pressure, but I haven't found any evidence that they were absent from the mountains.
Also, herds of elk are much easier to spot in open ...
Here is how Bob Robb field dresses his elks. Warning: There are images of actual elks being quartered.
Secure the Elk
Before any cutting begins, you have to secure the elk, which often has expired on a steep sidehill. That’s where the cord or rope comes in, used to tie antlers or legs to a tree or bush to hold the animal in place as you work. Point ...
The caller should be at least 50 yards downwind of of the hunter. The reason is that
elk have a good sense where a call is coming from and won't get very close
(usually around 50 yards) to that spot unless they see another elk. If the
caller is right next to the hunter, the elk will usually stay just out of range.
However, if the caller is back more than ...
The tricks are,
Humans carry both bugle (bull) and cow calls, while a bull elk won't make cow noises. So hearing a bugle and then a cow call from the same place is almost guaranteed to be a human.
Humans can be over eager to respond and will bugle back very quickly while elk will take a while.
Elk move around while humans will usually stay in the same spot ...
Your going to want to debone it to pack it most efficiently into the coolers, otherwise the quarters are going to be too big and awkward to fit into the coolers and they are really heavy.
Once deboned, place 20-25 lbs of meat into double bagged garbage bags for easier handling.
From experience, something like a single 150 to 200 quart cooler will be enough,...
Have a look at Can deer see blaze orange?. They have a picture of a hunter rendered how we think it looks to deer.
The orange vest (without camo pattern) becomes indistinguishable from a yellow-green-brownish color, sticking less out in terms of color but very much due to its uniformity.
The blueish-with camo trousers stick very much out as blue.
You need to optimize for putting the shooter in the best place to intercept the bull on the way to caller, while keeping both the caller and shooter downwind of the approach. The bull will try to approach the caller from as downwind as possible, depending on how angry/horny he is.
Generally, you will have an idea of which direction the elk will come from ...