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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

    ? Offline
    ? Offline
    Gæst
    wrote sidst redigeret af
    #10

    @Danpiker Fascinating! If you force your focus slowly moving towards a circle you can even get a gradiant.

    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

      arnebab@rollenspiel.socialA This user is from outside of this forum
      arnebab@rollenspiel.socialA This user is from outside of this forum
      arnebab@rollenspiel.social
      wrote sidst redigeret af
      #11

      @Danpiker That’s neat! thank you!

      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

        bltpizza@mastodon.socialB This user is from outside of this forum
        bltpizza@mastodon.socialB This user is from outside of this forum
        bltpizza@mastodon.social
        wrote sidst redigeret af
        #12

        @Danpiker Holding my phone at arms length all of the dots are purple.

        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

          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
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