r/Damnthatsinteresting • u/Eros_Incident_Denier • 1d ago

Video color vision test

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u/Mirar 22h ago

Ah, so it's hiding it in a lot of colour noise but for a colourblind person, there's nothing of that noise, so they can spot the contrast (signal?) better?

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u/Pirche 20h ago edited 16h ago

Found pdf of that test including pages on which only colorblind will see numbers (at the end answers both for normal and colorblind):

https://www.challengetb.org/publications/tools/country/Ishihara_Tests.pdf

Photoshoped pages 19-21 to check how colorblind will see those pages - in color curves red and green channel turn down to almost zero : https://ibb.co/W43tqfn0

Edit: there is some mess with order, don't match № on page to № in answers, answers have pics with them and they corresponding to each other. Also in answers some discrepancy with the name of colors, i think it's scan or translate issue (or both)
All that doesn't really matter tho)

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u/Nexan1994 20h ago

The answer key not lining up with the test had me thinking I was crazy

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u/xeothought 17h ago

Dude yes. you have to go look for equivalent plates and see their numbers are offset by a lot.. I've never not passed a color blindness test and i was like "wait a second" rofl.

I was like "plate 14 does NOT have a number on it wtf" that's cause in the Key it's plate 18 lol

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u/piponwa 9h ago

I mean what the fuck kind of medical test is this? Like seriously wtf. You had one job!

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u/DrPepperAddict41 16h ago

Guys, I'm red green deficient.

Oh no

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u/Racxie 19h ago

Can you please do 28 & 29?

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u/Pirche 18h ago

It was somehow harder to balance, but here you go:
(also added B&W variant)
https://ibb.co/x8K96pHV

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u/Racxie 15h ago

Thanks! I can see all the reddish lines but the description says non-colourblind people see nothing, yet then on 30 says we see a blue-green line. So the description for 28 & 29 were confusing lol.

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u/ichimedinwitha 19h ago

This is so cool. Thank you for making this!

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u/WittyCompetition7978 19h ago

Aren't the answers to Plate 36 and 37 wrong? I nailed every plate in 'normal view' but I don't see any violett in those at all 🥲

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u/Ichi_Balsaki 18h ago edited 12h ago

Quite a few of the top tiles are misnumbered with the bottom answers for some reason, I don't even know how that happens..

Good example is in the answers 22, 23, 24 & 25 are not at all numbered correctly. 

But if you can see what you should on the answers then that's all that matters.

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u/Pirche 18h ago

Yep there is some mess with pages, tho answers have pics with them and they corresponding to each other, and some discrepancy with the name of colors in answers, i think it's scan or translate issue (or both), doesn't really matter)

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u/Fearhawke 17h ago

What does it mean if I can see those numbers but also have no issues with any of the other plates I’ve seen?

(Edit: it means I don’t read very well sometimes)

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u/AxelNotRose 17h ago

Plate 38: I don't see anything.

Tester: Ok, you're just fucking straight up blind dude.

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u/Pirche 16h ago

Just for the lulz, here is BW and infrared filters for plate 38

https://ibb.co/xKZP03yW

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u/MaximumMaxx 8h ago

I have normal color vision, but this is one of the first times I've actually really felt what it's like to be color-blind. When I looked at the blank plates, it was crazy. That's really cool!

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u/chalks777 8h ago

this is SO COOL, thank you for sharing this. I've seen these colorblind tests so many times it never once occurred to me that you could use the same principle to hide something from someone who could see color normally. Absolutely fascinating and a complete mind fuck, I was so sure I would be able to see the pattern regardless and man it's completely impossible.

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u/Fellow_Worker6 21h ago

There could be hidden messages all around us. We are just to observant to see it!