Show HN: What's my JND? – a colour guessing game

jaffathecake

The associated deep-dive article is great https://www.keithcirkel.co.uk/too-much-color/

alexanderameye

Fun game! I could never quite clear the 0.0030 threshold. I wonder how much screen quality/calibration impacts it.

dreday

This takes something as nerdy as decimal places in CSS colors and turns it into a fun, practical read. It feels like you’re being walked through the rabbit hole by a friend who’s done way too much homework, then hands you a few simple rules you can actually remember and use.

dreday

I thought I was good at this but I can’t get under 0.0050. I blame my screen! Very addictive, kudos to the dev

pestatije

JND - Just Noticeable Difference - the smallest colour change that can actually be seen

filmgirlcw

Super fun game! My best is 0.0018 but am usually in the ~0.0030 range

filmgirlcw

This is such a cool deep dive into CSS colors and color theory and finding the right way to mess with color values.

erikig

On 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/

rahimnathwani

This 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: https://www.keithcirkel.co.uk/whats-my-jnd/?r=ArggKP__c4_b

nickdothutton

Eizo EV3285 and MkI eyeball probably ruined by years of screen time: 0.0052 https://www.keithcirkel.co.uk/whats-my-jnd/?r=AgcgKP__PX8P

dominikh

If 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.

john_strinlai

surprisingly 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.

Biganon

0.0023, but now my eyes are tired

stonedge

Is higher or lower "better"?

zakki

is 0.0052 good or bad?

vunderba

Nice job. Kind of reminds me of this one which increases the number of squares with the odd-one out becoming more subtle as you progress further in the game, but I prefer your sliding mechanic better for this kind of game. https://vectorization.eu/color-perception-test

brikym

Nice game very engaging. I got 0.0046 It helps if I move side to side like a party parrot. I'd love to see a histogram of where I stand.

OisinMoran

This is fun! I just played once and got 0.0016, which it says is "absurdly below the theoretical limit"... Okay, tried again and got 0.0034 which is still says is beyond the human limit! I'll have to give this to my mum because we often argue about colours and I suspect she might be a tetrachromat. Both tests on a Pixel 10 btw

vova_hn2

0.0025 Had to turn off the "Night Light" (reducing blue) and set brightness to max.

whalesalad

0.0028 -- I think a few of these surpassed the capabilities of my M2 air display.