• Oka@sopuli.xyz
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    4 months ago

    Red is complimentary to cyan.

    If the cyan were switched with yellow, the can would appear blue.

    Also, it’s not our brains creating the red, it’s our eyes. They get exhausted of seeing the cyan and replace it with red.

    • srecko@lemm.ee
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      4 months ago

      It is when you use cova cola instead of, lolipop, santa, flag, flower or some other red object.

      • psud@aussie.zone
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        4 months ago

        This site has no protection against marketing aside from moderator action (and in this case OP is a mod). I’m not certain OP chose a coke can for that image or whether this was simply the first version of that illusion that OP has seen

        I wonder if prolific posters are approached by advertisers. Is Lemmy big enough for them to bother?

  • smeg@feddit.uk
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    4 months ago

    Oh weird, I assume this is just because the white is relatively red compared to the cyan, right? As in if you took any image and coloured it in the same way then it would also look red.

    • Theblonde@lemmy.world
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      4 months ago

      Yeah, there seems to be a lot more going on here than just marketing. If you mask the logo, the red still works. I believe it has to do with the combinations of white/black, white/cyan, black/cyan and the relative size of the blocks to produce a red hue through complimentary color persistence or whatever it’s called.

      • dustyData@lemmy.world
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        4 months ago

        Brain uses expectations to decide what to fill perception with. you don’t expect hands to be the same red tone as cola cans.

  • chonglibloodsport@lemmy.world
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    4 months ago

    Nonsense. My phone screen uses red, green, and blue to make up each pixel. The white pixels have their red component all the way at full brightness. Therefore there is a lot of red in the picture.

    You could also see this by opening up the image and looking at the red channel which would not be completely black.

    • Valmond@lemmy.world
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      4 months ago

      Texts on computers is made this way, so use a magnifying glass on black white text in a word document (for example) and you’ll see lots of colors. zoom in using the computer and you will still just see black/white.

  • HuntressHimbo@lemm.ee
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    4 months ago

    Jokes on you, I’m moderately red green colorblind so I wouldn’t realize it if there was red present

      • RunawayFixer@lemmy.world
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        4 months ago

        I’m red green colorblind as well. I just see the background as white or a very light shade of grey. Someone else has made a post with a yellow can and in that one I see the background as yellow (which is basically the same as green to me, I have very little r in my rgb), especially the right side of the can.

  • FiniteBanjo@lemmy.today
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    4 months ago

    When its small thumbnail I can see it but when I look at the full size image I appear to be able to turn the effect off at will.

  • NigelFrobisher@aussie.zone
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    4 months ago

    It’s actually all just white light at different wavelengths, which tricks your brain into seeing different “colours”.

    • vonbaronhans@midwest.social
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      4 months ago

      White light is the combination of all those wavelengths. It is only the combination that makes it “white” in exactly the same way that a smaller range of wavelengths are “red” or “blue”.

  • underwire212@lemm.ee
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    4 months ago

    Is this because our brains have been programmed to see Coca Cola can as red? Or does it have something to do with the way the black and white boxes are organized? (I.e. if it were a sprite can, it would still be red)

    • flamingo_pinyata@sopuli.xyz
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      4 months ago

      I think it’s a bit of both. The light blue color used is so called “complement color”, meaning it’s exactly the opposite on the color wheel to the Coca Cola red. Black and white pattern suggests to our brain to play with contrast. And of course we all know Coca Cola from all the marketing.

      Btw, After staring at it for a while I can kinda switch between red and white at will. Anyone else?

      • tiramichu@lemm.ee
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        4 months ago

        Interesting :) And yes, for me it also became easy to switch once I was aware of the truth of what I was looking at.

        If you look directly at the can you can see it as white, but if you look elsewhere and the can is only in your peripheral vision it seems to always be interpreted as red.

      • snooggums@midwest.social
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        4 months ago

        At the size it is on my phone screen it looks very red. Zooming in makes it look like the red switches to white.

    • Swedneck@discuss.tchncs.de
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      4 months ago

      It’s effectively your brain doing automatic white balance, it sees everything being tinted cyan so it just sorta subtracts cyan from the area, which results in white being reddish

      you can do this physically (by tiring out the colour-sensing cells in your eyes) if you stare at a colour for about 30 seconds then quickly look at a white surface, you should see the inverse of the first colour.

    • werefreeatlast@lemmy.world
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      4 months ago

      I have myopia so if I place the phone far from my face I can’t see that it is even a can… I still see a little bit of a red area there.