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Comment by dqh | Hacker News Reader

I really like this, but FYI I do struggle to tell the difference between the first and last colour. There are probably others out there with this problem.

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You might have a slight color deficiency, you can try this online color vision acuity test: https://www.xrite.com/hue-test

that was a cool test, thanks for sharing it!

Yeah, I scored a 6 where 0 is perfect.

I scored a 0, but I still find the first and last colors to be hard to tell apart at a glance (though they might be easier to distinguish if they were right next to each other).

I scored a 0 and I have pretty bad colour vison (red-green/grey-pink) so I am not sure how much trust can be put into this test to determine that.

I did it, decided to compare results, and saw

> Best Score for your Gender -69420

> Worst Score for your Gender 1000000000

Someone doesn't sanitize their inputs?

I get this now:

> Best Score for your Gender -2147483648

> Worst Score for your Gender 2147483647

I scored a perfect 0 and while I can tell the difference, it's still pretty close. Purple/violet colors are just hard to discern in general.

Same here. Nice fat zero. Not bad for 61yo

I had a hard time distinguishing them with night shift enabled on my display. With a daylight white point it was easier but they are still close.

I scored a 0 in this test (really cool btw!) but I also have trouble distinguishing the first and last color in the palette.

I mean, I can see _some_ difference but they are very very close, and I am not sure I could distinguish them in, say, a line plot.

This test has as much to do with the monitor's gamma correction and color fidelity as anything else, IMO. Whenever I was unsure of the order, dragging the window over to a different monitor helped immensely. I was able to get a 0 by doing that, which I don't think I could have done on either monitor by itself.

My colour vision is absolutely perfect, and I wouldn't want to have to distinguish between the first and last in isolation in difficult circumstances.

Not really, they are just similar if you put it next to eachother (both are essentially shades of purple/violet) and as they are at different ends of scale it could get confusing if used as heatmap

> Attention! Please rotate your phone or view this test on a larger device for best results.

It doesn’t even let me dismiss that message. Who does this? Intentionally breaking your whole site because it might not look good. (This is an iPhone 14 max, so already a pretty big screen, and I’m in portrait orientation.)

The point is that the two ends of the spectrum look more similar than their own adjacent colors..

It feels like there should be more red in the far left color. I can distinguish them fine, it just looks off.

They do look very close. The left one has more red while the right one has more blue.

I can tell the difference but they do look very similar. The first is a brighter magenta and the bottom is a darker one.

I can also tell the difference, as displayed in a rainbow, but if they were next to each other in a data visualisation I think i'd have no chance.

On my laptop and phone I can tell the two apart both together and with some distance between them when in relatively isolated blocks with similar surroundings. I might struggle if one were surrounded by brighter colours than the other, though human visual perception had trouble with that anyway (hence the "those two colours are actually the same" optical illusions).

The screen I code/write/read on mainly is setup differently to be easier on the eye for long periods but is not as true in colour output, I think (I'm away from it right now so can't check) they may look nearer identical on there.

I suspect people reporting difficulty seeing the difference will be a mix of differences in their eyes and differences in they screen configuration (or screen quality: some things can't be configured around).

#2cb and #0bc look the same for me, while the first and last are different enough.

I know for sure I cannot complete a full ishihara plate test though so this one is on me.

Might be your monitor. I've seen some that make various similar colors look exactly the same.

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