robertjerl wrote:
Long ago I read an article from WWII about how they did trials to find the best colors to paint ships, aircraft and to make uniforms to keep people from seeing them so easily. They found that in some cases dark colors showed up against things like a light sky, moon lit backgrounds etc. And in other cases, a light color blended in with a light background. That is why you see so many military aircraft from certain eras with a light sky blue or gray belly and dark-colored tops. That light belly did not show up against a moonlit night sky, but a dark belly on the planes did show up.
Now with the stand-off weapons they don't have to fly over the enemy, so they have shapes and radar absorbing coatings that are mostly dark.
Long ago I read an article from WWII about how the... (
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Your remarks about testing for color visibility in different conditions rings so true.
Several times I have encountered bicyclists on rural, narrow, shoulderless roads, during daylight hours, even bright sunlight, but equally stark shadows across the roadway because of the forested environment.
Some colors, even bright multi-colors, in the spandex, or whatever type bicycle designer suits they are wearing, do not have enough stand apart contrast from the various colors and shades in the light/shadow/greens/blacks/yellows, etc, in the environment, to make them easily visible from as far away as would be nice.
If that is the case with an individual rider, maybe even two riders, it is sometimes a surprise to see how close the distance is when they are first recognizably visible. If there are 6-8 or more in a group, it is sometimes easier to spot them sooner, because there may be more variation in the colors that are being worn. The reflective stripes on safety vests do a better job showing up in those bright sun, dark shadow, mixed vegetation backgrounds.
Maybe some of the bicyclists realize that from their own observations while operating motor vehicles, because in the past couple years I see some of them also use bright flashing red or white lights on the backs of their bicycles......sure is a help to vehicle drivers!!
Another situation, in some construction work we were doing, my boss and I were about 275-280 yards apart. He was about a 25° - 30° angle up a slope from my position on an open hillside with some brush about 12" - 40" high. For the procedure we were doing, it was absolutely imperative we be able to see one another.
His safety vest was the safety lime green style.....well, lime green when it was new and spotlessly clean. Against the backdrop of that brush mixed with grass, his used, dirt-streaked safety vest was perfect camouflage.
We were communicating verbally by walkie-talkies and he was getting frustrated I could not see where he was....he could see my used, dirt-streaked blaze orange safety vest just fine. Finally, he held his dirt-streaked white hard hat in his hand and waved it around above his head. That movement, I could see, but when he put his hard hat on his head, again, I could make it out because I knew where it was, but it was like a hat by itself, no body below the head.