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> build perceptually uniform colormaps with accessibility considerations That is impossible, color-blind people wont see them as perceptually uniform since the

> build perceptually uniform colormaps with accessibility considerations That is impossible, color-blind people wont see them as perceptually uniform since the area with the color they can't see gets a lot darker. For example I can't see red text on a certain kinds of black background, as in I don't even recognize that there are letters there. I remember being on a presentation where the author apparently liked to play with colors, and several of the screens were just blank to me I didn't even know that I there were letters there I couldn't see.

poopchute 7y ago
I'm pretty sure this only affects protan(omaly/opia). The green and red cones along with the rods all play a roll in determining the brightness of any colour. When the red cone is shifted towards green, then all wavelengths to the right of that will be darkened. I thought tritanopia would experience this too since the blue cone is also an edge-of-the-rainbow cone, but apparently the blue cone plays a very small roll in detecting brightness. Therefore, a bright blue colour would appear to to someone with tritanopia as yellowish white, since it is nearly equally detected by the green & red cones.
pcmonk 7y ago
> the area with the color they can't see gets a lot darker Interestingly, for me (deuteranomolous) the colors I can't see often seem lighter. For example, green traffic lights appear white. I assumed this is because I can still see the light, it just doesn't get interpreted as green, but I don't know whether that's true.
- username90 7y ago
  Green lights are white to me as well, I guess they have a decent chunk of blue in them and people call them green due to the lack of red. (I see blue + green as white since I don't see red) But if you see it as white as well then I'd expect your problem to be with the color red and not the color green.
neilpanchal 7y ago
Matplotlib's developers talk about it here: https://youtu.be/xAoljeRJ3lU?t=738 https://youtu.be/xAoljeRJ3lU?t=738

poopchute 7y ago

I'm pretty sure this only affects protan(omaly/opia). The green and red cones along with the rods all play a roll in determining the brightness of any colour. When the red cone is shifted towards green, then all wavelengths to the right of that will be darkened. I thought tritanopia would experience this too since the blue cone is also an edge-of-the-rainbow cone, but apparently the blue cone plays a very small roll in detecting brightness. Therefore, a bright blue colour would appear to to someone with tritanopia as yellowish white, since it is nearly equally detected by the green & red cones.

pcmonk 7y ago

> the area with the color they can't see gets a lot darker Interestingly, for me (deuteranomolous) the colors I can't see often seem lighter. For example, green traffic lights appear white. I assumed this is because I can still see the light, it just doesn't get interpreted as green, but I don't know whether that's true.

username90 7y ago
Green lights are white to me as well, I guess they have a decent chunk of blue in them and people call them green due to the lack of red. (I see blue + green as white since I don't see red) But if you see it as white as well then I'd expect your problem to be with the color red and not the color green.

neilpanchal 7y ago

Matplotlib's developers talk about it here: https://youtu.be/xAoljeRJ3lU?t=738 https://youtu.be/xAoljeRJ3lU?t=738