Most disruptive camouflage patterns mostly provide a distinguishing feature, indicative of nationality.
For a predominantly green area, typical subtropical forests, a plain olive drab uniform would satisfy 80-90% of the color requirement of the camouflage skillset.
For a predominantly arid area, typical desert/plains, a plain khaki uniform would satisfy 80-90% of the color requirement of the camouflage skillset.
Camouflage is an individual skill, rather than just a color or pattern, that consists of several elements:-Shine
Covering up everything that can reflect light; skin, lenses, metal objects etc-Shadow/Contrast
Avoiding appearing as a shadow in a bright area, also avoiding highlighting natural shadows in the facial area (eyes, throat). Use shadows actively to hide. Avoid making multiple tracks in winter during movement, as they can cast a shadow and are easy to spot, especially from the air.-Shape
You want to erase the shape of the human body, and especially that of the head and shoulders. This is done regardless of head gear, and usually achieved by applying vegetation (local) or camo net bits. You also try to blur or erase any shapes that do not appear in nature, ie completely straight lines (rifle barrels etc) or circles (canon muzzles or objective lenses).-Color
We try to use colors that are found in nature, browns and greens, while avoiding colors that do not exist (black, yellow, red etc). By using natural colors there is less contrast with the surroundings.-Movement
The objective is to avoid detection because of movement, either during movement or in a static position. This not only relates to the body, but also the surrounding vegetation. A tree that gets snagged on a piece of gear, and violently comes loose has quite a characteristic motion.-Sound
Avoid making uneccessary sound. This can cover everything from twigs on the ground breaking, coughing, talking, fidgeting with weapons, velcro pouches opening etc. This is especially important at night, as normal activity is absent, so there is less ambient sound to cover the noise we make.-Silhouette
Avoid being highlighted against a lighter background (like snow) or the sky. This is relevant both during movement and when static. Also remember that the angle from the observer to you plays a part. While you might not be silhouetted to a person looking at you horizontally, a person below you might see you silhouetted against the sky.
Color is only one element here. Most people are actually located/spotted due to movement, either of themselves or surrounding vegetation, not color.
I am not saying that disruptive patterns do not offer some additional color-specific benefit over plain color uniforms, but it is hard to quantify. The best solution would be a single pattern for each specific environment, but that is hardly feasible.
At a given distance for each specific pattern, the colors blend and appear as one solid color. This is usually the happy medium, sufficient to blend into the surroundings.
For the norwegian woodland pattern, the color blend is as follows:
Dark Green(44% MGK-93)
Light Green(28% LGK-93)
Brown (28% BK-93)
At distances over 400 meters, this blends into olive green (OGK-96).
There are many apparent color variations in circulation, due to several different types of fabrics being used, and the fabric properties affecting the dye. Here is one iteration, shown on a Bergans Dermizax Smock:
This is of course for the MK 1 Eyeball Sensor. For other types of sensors you need additional qualities (IR, thermal etc).
When we recently went from matching uniforms and load bearing gear, to coyote brown gear, there was a lot of scepticism towards the new brown color in a norwegian environment. We found that during winter movement, the guys still wearing the woodland camo vests were easier to spot than the guys wearing the brown vests. This was because the woodland vests provided greater contrast over the winter overalls, ie darker, that the eye caught on to easier.
I think the USMC has the best solution with their Woodland and Desert MARPAT, and single color load bearing gear. Not saying that a pattern has to be digital, but their approach and color scheme seems to work very well.