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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

    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
                                        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
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