Nicolas Saunier
DanpikerThis 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.
Conchoid
Trickpaw
The Sleight Doctor ๐๐@Pikestreet @conchoid @Danpiker Nor me. I have a collection of optical illusions that do fool me though!
Lemme find them...
@ApostateEnglishman Lots of them work on me, just not this one for some reason!
@Pikestreet This one really bends my tiny mind!
It's not a spiral, but perfect concentric circles. ๐คฏ
derptron
Dgar
FediThing 
@crazyeddie @conchoid @Danpiker
Weirdly it worked better for me when the image was small in my timeline, the purple was much clearer, and zooming in made it less clear. I guess different people's brains have slightly different perceptions?
TrueNorthSpice ๐จ๐ฆ
Jean-Baptiste Fidรฉlia@jeantranscene @Danpiker
Grey-blue-ish background and blue dots. On a computer screen, but the screen is not that bad. Also don't know about color vision impairment to have.
Grey-blue-ish background and blue dots. On a computer screen, but the screen is not that bad. Also don't know about color vision impairment to have.
Marcin Wichary@Danpiker Oh, wow. It does, and incredibly quickly and intensely, too.
IgnorePriorInstructions
otacke
groxx
Pass the Dutchie@Danpiker
Cool! Thanks for this.
I recently watched a YT short on color theory. That was insightful and interesting.
Cool! Thanks for this.
I recently watched a YT short on color theory. That was insightful and interesting.
Cube
Bรธrge@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! ๐คฏ
D. G. MarshallYes. Whichever dot I focus on turns purple.
Kid Mania
Chris Ford 
@Danpiker Not at first, because I was wearing yellow-tinted sunglasses. When I took them off yes.
MrBlubber
ArneBab
Randall Lee@Danpiker Holding my phone at arms length all of the dots are purple.
Daniel Bohrer@Danpiker interestingly it works better for me on the smaller thumbnail than on the full version of the image
Amy de Buitlรฉir@Danpiker For me, the dot that I'm looking at doesn't change, but the remaining dots fade into the background.
Amos Mulder
Passwordsarehard4
PhilSalkieHave 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.
Elio Campitelli@PhilSalkie @Danpiker Huh. Does this means that we shouldn't be writing small text or rendering small details in blue?
@PhilSalkie @eliocamp @Danpiker rgb565 is a somewhat common color mode for this reason - we see green with the most detail, so when you're looking to reduce bits per pixel it makes sense to cut the other two slightly
@groxx @eliocamp @Danpiker
Makes sense, there are a number of monochrome photosensors designed to work near the center of the green visual peak as well.
What I found interesting was not just being able to decrease the number of bits of blue intensity for each pixel, but making the pixel count so much less for blue. We've reached a point in tech where speaking about "efficiency" marks you as being from a bygone age - but this seems like it could be a neat way to pack more images into fewer bytes.
Rรฉmi Letot@Danpiker
Amazing, I feel like my smartphone can track my eyes ๐
Amazing, I feel like my smartphone can track my eyes ๐
HowToPhil (Phillip R)@Danpiker It turns... a slightly darker blue, I think?
cherieherrjones@Danpiker I definitely see it. Very cool!
โฟ La Pantera Roja ๐ณ๏ธโ๐@Danpiker It also creates a blue trail when I scroll the image up and down. Neat!
Axel Hartmann@Danpiker - where to use?
guest bathroom wallpaper or <insert evil laughter> tablecloth
guest bathroom wallpaper or <insert evil laughter> tablecloth
@Danpiker or: legal texts
Bytebro ๐ฌ๐ง ๐บ๐ฆ ๐ฌ๐ฑDoesn't seem to 'work' for me. I have no colour blindness of which I'm aware!
itgrrl 
Solitha@TrueNorthSpice @itgrrl It can be about your electronics, too. I can see the effect on my new monitor, but not on my old one.
Dan Sandler@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?
Bill, organizer of stuff@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 @wcbdata I found the effect was visible on one of my dual monitors, a new one, but not on the old one.
Shaun Chamberlin@Danpiker
Nothing happens for me
Nothing happens for me
Mill&tea๐Didnt see it until I put my phone back a lil further from my face. Cool!
Pierre Pebble@Danpiker this is absolutely wild! It definitely works for me
J.D. MacLeod ๐จ๐ฆ@Danpiker not really seeing it #MaybeThatsJustMe
KeithWM
zombiecideใ้ฆฌ้@Danpiker minimally, but the dots hurt because at the boundaries there are flecks greyish-whitish visual noise
Barbarast
Claudius
Elias Mรฅrtenson