> First, if you have the option of using one or the other, do so. Like, you can use red, blue, yellow, purple, and black for lines on a graph before you even need to find an additional color like green.
I don't see this advice getting much uptake.
First, green isn't a second thought for people with normal vision. It's a first thought. I can understand how this wouldn't be true if, to you, it didn't exist.
Second, the color space without green is harder to draw contrasts in than the color space with green.
Third, a friend of mine with red/green colorblindness always complained that he couldn't tell the difference between blue ("rare") and purple ("epic") items in World of Warcraft. (WoW has since solved this problem by throwing out the concept of item quality entirely, but the colors are still there anyway.)
So you're advising that people should make a quite unnatural choice, which will markedly reduce usability for almost everyone, but which won't actually solve the problem for the colorblind. It's just not a move that makes sense.
> Third, a friend of mine with red/green colorblindness always complained that he couldn't tell the difference between blue ("rare") and purple ("epic") items in World of Warcraft.
I call things that are apparently clearly blue “purple” a lot–I assume some sort of overcompensation of some sort. It’s strange how we adapt, isn’t it?
I don't see this advice getting much uptake.
First, green isn't a second thought for people with normal vision. It's a first thought. I can understand how this wouldn't be true if, to you, it didn't exist.
Second, the color space without green is harder to draw contrasts in than the color space with green.
Third, a friend of mine with red/green colorblindness always complained that he couldn't tell the difference between blue ("rare") and purple ("epic") items in World of Warcraft. (WoW has since solved this problem by throwing out the concept of item quality entirely, but the colors are still there anyway.)
So you're advising that people should make a quite unnatural choice, which will markedly reduce usability for almost everyone, but which won't actually solve the problem for the colorblind. It's just not a move that makes sense.