this post was submitted on 03 Jul 2024
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Science Memes

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[–] [email protected] 3 points 4 months ago* (last edited 4 months ago)

Here's another version

The poster in the image is the original source for the coke can op posted btw

[–] [email protected] 5 points 4 months ago* (last edited 4 months ago)

...I was gonna say it took until it was shrunk down to the thumbnail to see red, but nope, it actually has red in it in the thumbnail.

Guess this is specific to how often you see cans of coca-cola?

Here, I put the image through a ditherer (only available colours are black, cyan, white). I don't see any red at all now.

[edit}

Actually, that "red" is mostly just gray so I played myself here. Still, the luminosity must be closer to red before I detect it as red, white doesn't do it.

[–] [email protected] 23 points 4 months ago
[–] [email protected] 4 points 4 months ago

Except that there is. Alright, maybe not exactly, but...

The whites that you see as white (in the other white parts which don't seem red), are shifted like #E0F9F8. Notice the reduced reds there.

The whites you see as red are shifted like #F9F9F7. This one, I'd probably call yellow, but you get the point, reduced blues. There's probably a better example pixel in there and I just haven't found it.

The red pixels in the thumbnail, well, maybe JPEG downscaling? I can't say, because I don't know what downscaling algorithm is being used.


So the parts you see as white, are actually bluish white in a sea of blue (Cyan is just mixtures of blue and green in case of RGB) and the part you see as red, are reddish white, in a sea or blue.

Also, for those who don't see red, don't look straight at the image. Look at something near it, with the image in your peripheral vision and you'll get what others are saying. But I guess that happened while you were reading the title.

[–] [email protected] 17 points 4 months ago (2 children)
[–] [email protected] 27 points 4 months ago

White light has red in it. Cyan does not. We fatigue blue and green cones everywhere but the white can, and we only stimulate the red cones on the white can. The result is it looks red.

[–] [email protected] 8 points 4 months ago (1 children)

Thank you. I thought this was going to be like the dress.

[–] [email protected] 2 points 4 months ago (1 children)

The white and gold dress, you mean?

[–] [email protected] 1 points 4 months ago
[–] [email protected] 28 points 4 months ago

I think there's something more going on here than just "marketing". Because if you look at the tiny thumbnail in the OP it's very clearly red, and you can even load that thumbnail into an image editor and zoom in to see slightly reddish pixels.

So something happens when scaling this image that actually results in a red hue, and I don't think my computers image scaling algorithms are also falling for "marketing". I would guess it's actually some kind of sub-pixel trick that makes it seem like there's colors there which aren't, and that's why the image scaling algorithms also reveal the same colors you see.

[–] [email protected] 4 points 4 months ago* (last edited 4 months ago)

Pretty sure this is stolen from a Facebook account I follow but I can't remember the name at the moment and will edit it in if I find it

Edit: the account name is Japanese

2nd edit: found it

https://www.facebook.com/share/6U4q8zuJr7usVgtk/?mibextid=qi2Omg

[–] [email protected] 14 points 4 months ago (1 children)

I'm colorblind this trick doesn't work with me

[–] [email protected] 21 points 4 months ago (2 children)

Your mind compensates for the teal which makes the white look red.

[–] [email protected] 1 points 4 months ago

It makes gray look red because it's similar luminosity. White still looks white.

[–] [email protected] 1 points 4 months ago (2 children)

then why are the other parts still white

[–] [email protected] 1 points 4 months ago

The image has teal-black parts and white-black parts, the white-black parts look like they're red-black

[–] [email protected] 8 points 4 months ago

Weird but if I focus my mind so to say it appears white but then if I relax then again red

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