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Show HN: What's my JND? – a colour guessing game
11–20 of 65 posts
Re: Show HN: What's my JND? – a colour guessing game
#12This is interesting but the result must depend on the screen and the brightness, no?
I tried it on a recent Pixel with brightness set to two-thirds, and this is my result:
Re: Show HN: What's my JND? – a colour guessing game
#13Eizo EV3285 and MkI eyeball probably ruined by years of screen time: 0.0052
https://www.keithcirkel.co.uk/whats-my-jnd/?r=AgcgKP__PX8P
Re: Show HN: What's my JND? – a colour guessing game
#14If 0.02 is the JND of deltaEOK, how come everybody is getting results an order of magnitude smaller? Even the author himself (at https://www.keithcirkel.co.uk/too-much-color/) says they get 0.0028, but never elaborate on the significance of that result.
Re: Show HN: What's my JND? – a colour guessing game
#15On a good monitor, I got to 0.0032 and then it all fell apart. Here's the related article on how much accuracy is really needed in CSS values. https://www.keithcirkel.co.uk/too-much-color/
It's worse.
The code contains a function that, given the target ΔE, generates two colors in floating-point Oklab representation, separated by that distance. But there is no check whether the two generated colors end up rounding to exactly the same one on 8-bit displays. So, I was asked to find a boundary (while the claim was that there were two distinct colors 0.0013 ΔE apart) between RGB(80, 83, 152) and RGB(80, 83, 152). Obviously unfair.
Re: Show HN: What's my JND? – a colour guessing game
#16surprisingly fun.
not knowing anything about color, i will admit i am a bit confused. i scored 0.0034 and was told "if you're not already calibrating displays for a living, you're leaving money on the table". which, to me, implied i did quite well!
but, reading the scores posted here, most people are doing a lot better than me. i doubt all of us are crazy good...
so, i assume the front page is a typo: "most people land around 0.02" (should be 0.002, not 0.02)? if yes, then i am back to not understanding the message i got about calibrating displays, because i did quite a bit worse than 0.002.
edit: nerd-sniping myself a little bit. but it appears (stressing: i know nothing) the "0.02" is accurate, but calculated by showing someone two colors and asking "are these different" until the person answers the question correctly 50% of the time. which is a different question than "where, precisely, is the line between these two colors". with the different question, it ends up compressing the result down by about an order of magnitude.
Re: Show HN: What's my JND? – a colour guessing game
#170.0023, but now my eyes are tired
Re: Show HN: What's my JND? – a colour guessing game
#18Is higher or lower "better"?
Re: Show HN: What's my JND? – a colour guessing game
#19Is higher or lower "better"?
lower is better.
it is measuring the smallest color distance you can still detect. so a lower number means you can spot the difference between two more-alike colors.
Re: Show HN: What's my JND? – a colour guessing game
#20If 0.02 is the JND of deltaEOK, how come everybody is getting results an order of magnitude smaller? Even the author himself (at https://www.keithcirkel.co.uk/too-much-color/ ) says they get 0.0028, but never elaborate on the significance of that result.
JND is an average. A lot of people will do a lot worse. The measure, as I understand it, is also under different test conditions, while this is a game where people are on their own and able to - for example - tilt their head trying to find the exact angle to see the difference.