61–70 of 165 posts
> I can drive a car and I stop when the light is red and go when the light is green. I'm also slightly colorblind and pure green light would be harder to distinguish from distance (not critical because there is also light position, but still). That's why traffic lights usually have cyan tint.
>> Maybe I can help you understand how that impairment—and it is an impairment, however mild... This is actually a slightly controversial claim. While r/g color-blind individuals do have difficulty viewing colors, they seem to have an easier time seeing through camouflage: A study on the ability to distinguish tones of khaki: https://www.discovermagazine.com/mind/in-combat-stick-with-t... There is strong anecdotal ev…
https://jov.arvojournals.org/article.aspx?articleid=2135713
Normal trichromats read Ishihara plates using their L- and M-cones. Red-green color vision defective observers rely on S-cone and luminance signals in reading the plates. Some normal trichromats can read the hidden digit plates because they can extract S-cone signal difference efficiently despite the distraction from L- and M-cones.
I'm r/g colorblind, and suddenly the indistinguishability of small colored objects makes sense now. Wow. Okay then. I hate multicolor LEDs with a passion. Those little amber or green dots look identical to me, even when you put them side by side. I use a phone app that uses the camera and shows me RGB values at a reticule. I've gone through rack and racks of equipment with that app, looking for things like dead drive…
Great article. Ummm... dumb question, but... stars are colored? (Color blind poster here).
Yes. I still see the colors of stars, but it's like a pale color. They are mostly white, but some tend toward red, others yellow, others blue. There's definitely a difference. When I see Mars, it is definitely more red, especially so when it is closer. But I distinctly remember my young eyes, probably when I was 4, that the the stars had a lot more color than they do now. I remember talking about it with my mother wh…
I've got mild red-green colorblindness (less severe than the author's); this article is great, and goes into much more detail than I knew beforehand. If I could add some suggestions to the author's at the end: * 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. * Secon…
I'm r/g colorblind, and suddenly the indistinguishability of small colored objects makes sense now. Wow. Okay then. I hate multicolor LEDs with a passion. Those little amber or green dots look identical to me, even when you put them side by side. I use a phone app that uses the camera and shows me RGB values at a reticule. I've gone through rack and racks of equipment with that app, looking for things like dead drive…
I've also noticed that it's much more difficult to differentiate tones and colours of small objects.
Cues were mentioned in the article, and I think I subconsciously rely on these a lot. For example, with traffic lights I know what the colours should be from top to bottom, and so I "see" them as the right colours - yet if you took photos showing only the colours in the abstract, I couldn't tell any difference between red and amber, and indeed I wouldn't be able to accurately tell you what colour any of them was.
Something people find interesting is that I often don't know what colour something is, but I'm often able to narrow it down to 2 or 3 choices - usually based on context and other cues, and also based on how I know I can misperceive colours. For example, I know I often see pink as grey, so if you showed me something pink, I might think it was "pink, or grey or green".
Another random anecdote that demonstrates the use of cues: years ago we had an old CRT TV, and every now and then it would suddenly display only in black and white. It really annoyed my wife, but I never even noticed - I guess in my head I "saw" someone's coat as red, for example. My mind just kind of filled in the blanks, like I suppose it must always do.
I'm r/g colorblind, and suddenly the indistinguishability of small colored objects makes sense now. Wow. Okay then. I hate multicolor LEDs with a passion. Those little amber or green dots look identical to me, even when you put them side by side. I use a phone app that uses the camera and shows me RGB values at a reticule. I've gone through rack and racks of equipment with that app, looking for things like dead drive…
> I use a phone app that uses the camera and shows me RGB values at a reticule. Could you share the app name? It would make my life a bit easier (I hate those red/amber/green leds that look identical) :)
If you get it, I'd recommend going into the settings and increasing the sample size - it defaults to "small", which given the way it flickers I'd guess means "1 pixel" :) I use it on the "large" setting, and it works great.
The idea is that the designer or developer can point their iPhone/iPad at design to get some idea of what it might be like for someone else to view it.
https://apps.apple.com/gb/app/vision-impairment-simulator/id...
Interesting thing about people with deuteranomaly, is that in some situations we can utilize luminance and S-cone data better than most people with normal vision. That's how Ishihara hidden plates work (numbers that are visible only with color vision deficiency). But some normal trichromats can also read these hidden plates: https://jov.arvojournals.org/article.aspx?articleid=2135713
To understand how it feels lets compare with a superior vision of birds [1]. "That bird is mostly black", I see what it does not see.
With normal vision colors pop out. I've checked once emulation, animal tongue is so red (displayed as hot pink), the brightest point on the picture. Meanwhile it is "just red" for me.
As for degrees, I had a Cub Scout making a craft project. He held up a pipe cleaner and asked "Is this green?" It was black. Jet black. I said "No, its black". Oh. He selected another (green) one and all was well.
So it can be complicated for some.