For those who want to test their perception of colour, I made a little game called "What's My JND"

[loke@functional.cafe]

@keithamus What's My JND? 0.0028
Can you beat it? https://www.keithcirkel.co.uk/whats-my-jnd/?r=ARUiKP__93yv
Now, I suspect the monitor you are using can have an impact. I was using my phone, which is a Samsung Galaxy S24, and I increased brightness to about 85% in a not very bright room. Also, in one of my correct answers, I was bet unsure, and my guess was quite off, but counted as correct, so probably some luck there.

[peturdainn@mastodon.social]

@keithamus
What's My JND? 0.0044
Can you beat it? https://www.keithcirkel.co.uk/whats-my-jnd/?r=AbchKP__7w2_

[catawu@mastodon.social]

@lisyarus @keithamus I found that when the response flashed at me it was like a glare stain and took forever for my eyes to try and adjust (it’s nighttime here). I have glare sensitivity and have to wear shaded lenses even indoors depending on the light. I did ok, I think, for an old lady.

[emkingma@mstdn.social]

@keithamus I'm kind of confused as to what you're meant to input when you notice the difference?

[keithamus@indieweb.social]

@emkingma you're supposed to click the area where you think the background transitions from one colour to the next. It could be clearer, but I am not sure how best to make it clearer.

[pixretro@mastodon.social]

@keithamus What's My JND? 0.0047
Can you beat it? https://www.keithcirkel.co.uk/whats-my-jnd/?r=AdUfKP__7zSz

Not a true representation as i realised i could move the wondow around my screen and the colours changed... lol!! Might be time for a new monitor...

[karolherbst@chaos.social]

@keithamus got 0.0018, but I'm also on an HDR display and was wondering if that helps with getting a lower value there.

[codecat@meow.social]

@keithamus This was fun. My partner got 0.0018!

[lukew@toot.wales]

@keithamus @joface I pulled out a cloth and wiped my screen down to get the optimal score I could glad it's not just me

[keithamus@indieweb.social]

@karolherbst they're all in sRGB so HDR _shouldn't_ matter, but having a good display which can represent all of sRGB certainly will matter.

[idgs@mas.to]

@keithamus Fun! And interesting!

[emkingma@mstdn.social]

@keithamus thanks, that's all I needed to know.

Mine's 0.0062
https://www.keithcirkel.co.uk/whats-my-jnd/?r=AmghKP__7l-8

[chris@nutmeg.social]

@keithamus Well I guess it's a draw.

The dirt streaks on my screen kept throwing me off while searching for the disturbance in the force.

[harry_wood@en.osm.town]

@keithamus @emkingma I feel like it needs a little instruction "Click on the line between colours" displayed before your first click. I was confused until I'd got the first one wrong.

[bieberium@infosec.exchange]

@keithamus
Light colors fooled me, especially greens. I'm marking this down to my display not being able to display these nuances, never ever my eyes (note that this sentence contains sarcasm)

What's My JND? 0.0032
Can you beat it? https://www.keithcirkel.co.uk/whats-my-jnd/?r=AUAgKP__7zj1

[keithamus@indieweb.social]

@harry_wood @emkingma Good feedback. I've updated the intro wording.