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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

    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
                                    0
                                    • forteller@tutoteket.noF forteller@tutoteket.no

                                      @Danpiker This is trippy as hell! I also feel like the border is more distinct when it's purple, but I can't really check because they all turn purple when I look at them! 🤯

                                      forteller@tutoteket.noF This user is from outside of this forum
                                      forteller@tutoteket.noF This user is from outside of this forum
                                      forteller@tutoteket.no
                                      wrote sidst redigeret af
                                      #33

                                      @Danpiker OK, so now, looking at it on my phone, they're all purple! And the one I look at is only slightly darker purple. Wild stuff. 😅

                                      1 Reply Last reply
                                      0
                                      • wcbdata@vis.socialW wcbdata@vis.social

                                        @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 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
                                        #34

                                        @wcbdata @Danpiker Using a laptop. Yoga 910. Quick duck search leads me to believe there's no such filter on its screen. My night light shift software isn't on.

                                        vOv

                                        solitha@mastodon.socialS 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

                                          mstr_milktea@blorbo.socialM This user is from outside of this forum
                                          mstr_milktea@blorbo.socialM This user is from outside of this forum
                                          mstr_milktea@blorbo.social
                                          wrote sidst redigeret af
                                          #35

                                          @Danpiker

                                          Didnt see it until I put my phone back a lil further from my face. Cool!

                                          1 Reply Last reply
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