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FARVEL BIG TECH
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  3. This illusion was new to me.

This illusion was new to me.

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  • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

    This illusion was new to me. Does whichever dot you look at turn more purple?

    Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

    https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

    https://arxiv.org/abs/2509.11582

    daniel_bohrer@chaos.socialD This user is from outside of this forum
    daniel_bohrer@chaos.socialD This user is from outside of this forum
    daniel_bohrer@chaos.social
    wrote sidst redigeret af
    #13

    @Danpiker interestingly it works better for me on the smaller thumbnail than on the full version of the image

    1 Reply Last reply
    0
    • conchoid@mastodon.gamedev.placeC conchoid@mastodon.gamedev.place

      @Danpiker i don't see it

      pikestreet@ohai.socialP This user is from outside of this forum
      pikestreet@ohai.socialP This user is from outside of this forum
      pikestreet@ohai.social
      wrote sidst redigeret af
      #14

      @conchoid @Danpiker this has never worked for me either!

      1 Reply Last reply
      0
      • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

        This illusion was new to me. Does whichever dot you look at turn more purple?

        Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

        https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

        https://arxiv.org/abs/2509.11582

        mhwombat@mastodon.socialM This user is from outside of this forum
        mhwombat@mastodon.socialM This user is from outside of this forum
        mhwombat@mastodon.social
        wrote sidst redigeret af
        #15

        @Danpiker For me, the dot that I'm looking at doesn't change, but the remaining dots fade into the background.

        amosmulder@mastodon.socialA P 2 Replies Last reply
        0
        • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

          This illusion was new to me. Does whichever dot you look at turn more purple?

          Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

          https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

          https://arxiv.org/abs/2509.11582

          philsalkie@mindly.socialP This user is from outside of this forum
          philsalkie@mindly.socialP This user is from outside of this forum
          philsalkie@mindly.social
          wrote sidst redigeret af
          #16

          @Danpiker

          Have a look at:

          https://gamesx.com/misctech/visual.htm

          Your eyes have much lower resolution in blue light than in red or green, the article demonstrates that increasing the size of the blue pixels by 9 times (3x3) makes an almost imperceptible change in the image. Link rot has taken the extra images and a diagram showing a proposed pixel layout of a big blue diamond surrounded by small red and green squares.

          eliocamp@mastodon.socialE 1 Reply Last reply
          0
          • philsalkie@mindly.socialP philsalkie@mindly.social

            @Danpiker

            Have a look at:

            https://gamesx.com/misctech/visual.htm

            Your eyes have much lower resolution in blue light than in red or green, the article demonstrates that increasing the size of the blue pixels by 9 times (3x3) makes an almost imperceptible change in the image. Link rot has taken the extra images and a diagram showing a proposed pixel layout of a big blue diamond surrounded by small red and green squares.

            eliocamp@mastodon.socialE This user is from outside of this forum
            eliocamp@mastodon.socialE This user is from outside of this forum
            eliocamp@mastodon.social
            wrote sidst redigeret af
            #17

            @PhilSalkie @Danpiker Huh. Does this means that we shouldn't be writing small text or rendering small details in blue?

            philsalkie@mindly.socialP 1 Reply Last reply
            0
            • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

              This illusion was new to me. Does whichever dot you look at turn more purple?

              Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

              https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

              https://arxiv.org/abs/2509.11582

              rletot@mamot.frR This user is from outside of this forum
              rletot@mamot.frR This user is from outside of this forum
              rletot@mamot.fr
              wrote sidst redigeret af
              #18

              @Danpiker
              Amazing, I feel like my smartphone can track my eyes 😃

              1 Reply Last reply
              0
              • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                This illusion was new to me. Does whichever dot you look at turn more purple?

                Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                https://arxiv.org/abs/2509.11582

                howtophil@mastodon.socialH This user is from outside of this forum
                howtophil@mastodon.socialH This user is from outside of this forum
                howtophil@mastodon.social
                wrote sidst redigeret af
                #19

                @Danpiker It turns... a slightly darker blue, I think?

                1 Reply Last reply
                0
                • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                  This illusion was new to me. Does whichever dot you look at turn more purple?

                  Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                  https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                  https://arxiv.org/abs/2509.11582

                  cherieherrjones@mastodon.socialC This user is from outside of this forum
                  cherieherrjones@mastodon.socialC This user is from outside of this forum
                  cherieherrjones@mastodon.social
                  wrote sidst redigeret af
                  #20

                  @Danpiker I definitely see it. Very cool!

                  1 Reply Last reply
                  0
                  • eliocamp@mastodon.socialE eliocamp@mastodon.social

                    @PhilSalkie @Danpiker Huh. Does this means that we shouldn't be writing small text or rendering small details in blue?

                    philsalkie@mindly.socialP This user is from outside of this forum
                    philsalkie@mindly.socialP This user is from outside of this forum
                    philsalkie@mindly.social
                    wrote sidst redigeret af
                    #21

                    @eliocamp @Danpiker
                    It probably means not just that but we should be compressing the blue layer much more than the green or red when doing lossy compression algorithms.

                    1 Reply Last reply
                    0
                    • mhwombat@mastodon.socialM mhwombat@mastodon.social

                      @Danpiker For me, the dot that I'm looking at doesn't change, but the remaining dots fade into the background.

                      amosmulder@mastodon.socialA This user is from outside of this forum
                      amosmulder@mastodon.socialA This user is from outside of this forum
                      amosmulder@mastodon.social
                      wrote sidst redigeret af
                      #22

                      @mhwombat @Danpiker Interesting, I see both effects.

                      1 Reply Last reply
                      0
                      • davidtheeviloverlord@mastodon.socialD davidtheeviloverlord@mastodon.social

                        @Danpiker

                        Yes. Whichever dot I focus on turns purple.

                        clintruin@mastodon.socialC This user is from outside of this forum
                        clintruin@mastodon.socialC This user is from outside of this forum
                        clintruin@mastodon.social
                        wrote sidst redigeret af
                        #23

                        @davidtheeviloverlord @Danpiker
                        Same.

                        1 Reply Last reply
                        0
                        • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                          This illusion was new to me. Does whichever dot you look at turn more purple?

                          Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                          https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                          https://arxiv.org/abs/2509.11582

                          beckermatic@mastodon.laB This user is from outside of this forum
                          beckermatic@mastodon.laB This user is from outside of this forum
                          beckermatic@mastodon.la
                          wrote sidst redigeret af
                          #24

                          @Danpiker It also creates a blue trail when I scroll the image up and down. Neat!

                          1 Reply Last reply
                          0
                          • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                            This illusion was new to me. Does whichever dot you look at turn more purple?

                            Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                            https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                            https://arxiv.org/abs/2509.11582

                            axel_hartmann@digitalcourage.socialA This user is from outside of this forum
                            axel_hartmann@digitalcourage.socialA This user is from outside of this forum
                            axel_hartmann@digitalcourage.social
                            wrote sidst redigeret af
                            #25

                            @Danpiker - where to use?
                            guest bathroom wallpaper or <insert evil laughter> tablecloth

                            axel_hartmann@digitalcourage.socialA 1 Reply Last reply
                            0
                            • axel_hartmann@digitalcourage.socialA axel_hartmann@digitalcourage.social

                              @Danpiker - where to use?
                              guest bathroom wallpaper or <insert evil laughter> tablecloth

                              axel_hartmann@digitalcourage.socialA This user is from outside of this forum
                              axel_hartmann@digitalcourage.socialA This user is from outside of this forum
                              axel_hartmann@digitalcourage.social
                              wrote sidst redigeret af
                              #26

                              @Danpiker or: legal texts

                              1 Reply Last reply
                              0
                              • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                                This illusion was new to me. Does whichever dot you look at turn more purple?

                                Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                                https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                                https://arxiv.org/abs/2509.11582

                                bytebro@mastodonapp.ukB This user is from outside of this forum
                                bytebro@mastodonapp.ukB This user is from outside of this forum
                                bytebro@mastodonapp.uk
                                wrote sidst redigeret af
                                #27

                                @Danpiker

                                Doesn't seem to 'work' for me. I have no colour blindness of which I'm aware!

                                1 Reply Last reply
                                0
                                • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                                  This illusion was new to me. Does whichever dot you look at turn more purple?

                                  Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                                  https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                                  https://arxiv.org/abs/2509.11582

                                  itgrrl@infosec.exchangeI This user is from outside of this forum
                                  itgrrl@infosec.exchangeI This user is from outside of this forum
                                  itgrrl@infosec.exchange
                                  wrote sidst redigeret af
                                  #28

                                  @Danpiker

                                  a #ProTip for those playing along at home – if you have “night shift” (iOS) or “eye comfort” (Android) on you’ll probably need to turn it off to see the effect, otherwise all the dots will just look purple 💁‍♀️

                                  truenorthspice@mastodon.worldT 1 Reply Last reply
                                  0
                                  • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                                    This illusion was new to me. Does whichever dot you look at turn more purple?

                                    Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                                    https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                                    https://arxiv.org/abs/2509.11582

                                    dsandler@mastodon.socialD This user is from outside of this forum
                                    dsandler@mastodon.socialD This user is from outside of this forum
                                    dsandler@mastodon.social
                                    wrote sidst redigeret af
                                    #29

                                    @Danpiker what's fascinating about this is that, as someone with deuteranomaly, _none_ of the dots is obviously purple for me, on any background. they all seem "blue, but if you told me they're actually purple, I would believe you", which is just really common for me.

                                    that must mean that the amount of short-wavelength sensitivity loss in the fixated area is not enough to offset the confusion (and overall lower information content) of overlapping long/medium wavelength response?

                                    1 Reply Last reply
                                    0
                                    • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                                      This illusion was new to me. Does whichever dot you look at turn more purple?

                                      Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                                      https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                                      https://arxiv.org/abs/2509.11582

                                      wcbdata@vis.socialW This user is from outside of this forum
                                      wcbdata@vis.socialW This user is from outside of this forum
                                      wcbdata@vis.social
                                      wrote sidst redigeret af
                                      #30

                                      @Danpiker TIL (from someone who said "this doesn't really work") - this doesn't work if your phone has a blue-light-blocking filter on it!

                                      crazyeddie@mastodon.socialC 1 Reply Last reply
                                      0
                                      • danpiker@mathstodon.xyzD danpiker@mathstodon.xyz

                                        This illusion was new to me. Does whichever dot you look at turn more purple?

                                        Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

                                        https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

                                        https://arxiv.org/abs/2509.11582

                                        darkoptimism@mstdn.socialD This user is from outside of this forum
                                        darkoptimism@mstdn.socialD This user is from outside of this forum
                                        darkoptimism@mstdn.social
                                        wrote sidst redigeret af
                                        #31

                                        @Danpiker
                                        Nothing happens for me

                                        1 Reply Last reply
                                        0
                                        • conchoid@mastodon.gamedev.placeC conchoid@mastodon.gamedev.place

                                          @Danpiker i don't see it

                                          crazyeddie@mastodon.socialC This user is from outside of this forum
                                          crazyeddie@mastodon.socialC This user is from outside of this forum
                                          crazyeddie@mastodon.social
                                          wrote sidst redigeret af
                                          #32

                                          @conchoid @Danpiker I had to work pretty hard at it.

                                          I had to open the many dots image alone and zoom in. Then if I stare at a dot really hard it does appear to be ever so slightly darker a purple than the rest.

                                          My eyes hurt now and everything is blurry. Don't do this at home.

                                          1 Reply Last reply
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