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Prepared for Wikipedia by Adrian Pingstone in January 2004, based on the original created by Edward H. Adelson. See also same color.
This is possibly one of the most uncanny optical illusions in existence. No matter how hard you look, you may not be able to convince yourself that the two squares are the identical shade of grey. To check, try one of these methods:
Right click the large picture, save it to your hard drive, put it into your image editor, "select" square A and then pull it down onto square B. There will be an exact match in colour! An example of this proof can be seen at de:Bild:Optical greysquares proof.png
The presentation of this illusion here is linked to an animated GIF that demonstrates the color match. That animation demonstrates that B is also an exact match to the two "dark" squares straddling the corners closest to and farthest from the viewer (A is one of the latter two). Furthermore, it makes it clear that none of the "light" colored squares matches B (though the one diagonally touching B to the left comes close).
As above but use the Color Sampler Tool or whatever means you have of sampling the RGB values of a point on the picture. Both squares produce the same RGB values. JPEG artifacts may cause slight variation.
There is also a Flash animation of this illusion here.
Another animation in WMV, AVI_DIVX, SWF (flash) formats, and EXE file are available to download from this page
Right click the picture, choose Print, then cut out square A and position it on square B.
Easiest of all, get a piece of paper and cut windows in it so that only squares A and B are showing through!
Perhaps even easier than the above, if you place your finger covering the two to three squares that separate A and B, it can clearly be seen that they are the same color. In other words, forcefully ignoring the borders between the squares.
ไฟล, optical, greysquares, ไฟล, ประว, ไฟล, หน, าท, ภาพน, การใช, ไฟล, วนกลาง, อม, ลเก, ยวก, บภาพไม, ภาพท, รายละเอ, ยดส, งกว, าน, optical, greysquares, 8206, กเซล, ขนาดไฟล, โลไบต, ชน, ดไมม, image, jpeg, ปภาพหร, อไฟล, เส, ยงน, นฉบ, บอย, คอมมอนส, รายละเอ, ยดด, านล. ifl prawtiifl hnathimiphaphni karichiflswnklang khxmulekiywkbphaphimmiphaphthimiraylaexiydsungkwani Optical greysquares arp jpg 8206 496 400 phikesl khnadifl 14 kiolibt chnidimm image jpeg rupphaphhruxiflesiyngni tnchbbxyuthi khxmmxns raylaexiyddanlang epnkhxkhwamthiaesdngphlcak ifltnchbbinkhxmmxns khxmmxnsepnewbistinokhrngkarsahrbekbrwbrwmsuxesri thi khunsamarthchwyid phaphnimiphaphinrupaebbewketxr SVG hakphaph SVG thaihkaraesdngphldikwa hnathiichphaphnikhwrepliynipichphaph SVG aethn File Optical greysquares arp jpg File Checker shadow illusion svg sahrbkhxmulephimetimekiywkbphaphewketxr duthi karepliynipichphaph SVG inkhxmmxnsnxkcaknisamarthduephimetimekiywkb khxmulekiywkbkarrxngrbphaph SVG sahrbsxftaewrmiediywiki id inphasaxunAlemannisch العربية belaruskaya tarashkevica blgarski ব ল catala nohchijn cestina dansk Deutsch Ellhnika English British English Esperanto espanol eesti euskara فارسی suomi francais Frysk galego עברית hrvatski magyar հայերեն Bahasa Indonesia Ido italiano 日本語 ქართული 한국어 lietuviu makedonski മലയ ള Bahasa Melayu norsk bokmal Plattduutsch Nederlands norsk nynorsk norsk occitan polski portugues portugues do Brasil romană russkij sicilianu Scots slovencina slovenscina srpski srpski svenska தம ழ ithy Turkce tatarcha tatarca ukrayinska veneto Tiếng Việt 中文 简体 中文 繁體 Prepared for Wikipedia by Adrian Pingstone in January 2004 based on the original created by Edward H Adelson See also same color This is possibly one of the most uncanny optical illusions in existence No matter how hard you look you may not be able to convince yourself that the two squares are the identical shade of grey To check try one of these methods Right click the large picture save it to your hard drive put it into your image editor select square A and then pull it down onto square B There will be an exact match in colour An example of this proof can be seen at de Bild Optical greysquares proof png The presentation of this illusion here is linked to an animated GIF that demonstrates the color match That animation demonstrates that B is also an exact match to the two dark squares straddling the corners closest to and farthest from the viewer A is one of the latter two Furthermore it makes it clear that none of the light colored squares matches B though the one diagonally touching B to the left comes close As above but use the Color Sampler Tool or whatever means you have of sampling the RGB values of a point on the picture Both squares produce the same RGB values JPEG artifacts may cause slight variation There is also a Flash animation of this illusion here Another animation in WMV AVI DIVX SWF flash formats and EXE file are available to download from this page Right click the picture choose Print then cut out square A and position it on square B Easiest of all get a piece of paper and cut windows in it so that only squares A and B are showing through Perhaps even easier than the above if you place your finger covering the two to three squares that separate A and B it can clearly be seen that they are the same color In other words forcefully ignoring the borders between the squares phuthuxlikhsiththikhxngphlnganni xnuyatihnaphlnganniipichid inthukwtthuprasngkh odyimcakdenguxnikhdankarthasa karnaipichephuxkarkha aelakarddaeplngaekikhphlnganni hmayehtuhakrupphaphnicaepntxngrabuchuxphusrangsrrkhphlngan krunaich Attribution aethn hakrupphaphniepnkhxngthanexng krunaich PD self aethn Copyrighted free use commons wikimedia org wiki File Optical greysquares arp jpg c 1995 Edward H Adelson These checkershadow images may be reproduced and distributed freely http web mit edu persci people adelson checkershadow illusion htmlExplanations and other animated examples of lightness perception and lightness illusions can be found in a paper by Adelson khabrryayodyyxithyephimkhabrryaythrrthdediywephuxkhyaykhwamwaiflnimixairixethmthiaesdngxyuiniflniprakxbdwysthanalikhsiththimilikhsiththisyyaxnuyatcopyrighted free use xngkvs prawtiifl khlikwnthi ewlaephuxduiflthipraktinkhnann wnthi ewlarupyxkhnadphuichkhwamehn pccubn11 54 13 minakhm 2548496 400 14 kiolibt AEvar Arnfjord Bjarmasoncropped 21 45 14 kumphaphnth 2548600 465 46 kiolibt 0 8 15 CopyrightedFreeUse hnathimiphaphni immihnaidoyngmathiphaphnikarichiflswnklang wikixuntxipniichiflni karichbn de wikipedia org Diskussion Optische Tauschung Wikipedia Kandidaten fur exzellente Bilder Archiv2005 4 karichbn en wikipedia org Wikipedia Featured picture candidates October 2004 Wikipedia Featured picture candidates delist 2007 Wikipedia Featured picture candidates delist Image Optical greysquares arp jpg User Durova FPC survey karichbn fr wikipedia org Utilisateur Ivoire8 Wikipedia Oracle semaine 50 2005 Utilisateur Grook Da Oger Mes curiosites karichbn fr wikibooks org Utilisateur Jean Jacques MILAN Illusions d optique karichbn he wikipedia org ראייה אשליה אופטית ויקיפדיה תמונה מומלצת הוספה למומלצים ארכיון 1 משתמש Avneref מדע פיזיקה מסע לתודעת הטבע karichbn hr wikipedia org Percepcijske varke karichbn is wikipedia org Sjonvilla karichbn ka wikipedia org ოპტიკური ილუზია ვიკიპედია რჩეული ფოტოები 2006 karichbn nn wikipedia org Optisk illusjon karichbn no wikipedia org Optisk illusjon karichbn pl wikipedia org Kontrast rownoczesny Wikipedysta DodekBot lista en7 Dyskusja Wikipedii Glosowania Flaga Polski w szablonach karichbn sr wikipedia org Optichka varka karichbn vi wikipedia org Ảo ảnh quang học karichbn xmf wikipedia org ოპტიკური ილუზია karichbn zh wikipedia org Portal 心理学 Portal 心理学 Picture karichbn zh wikiversity org School 心理學khxmulekiywkbphaph phaphnimikhxmulephimetim sungswnihymacakklxngdicitxlhruxsaeknenxrthisamarthekbkhxmuldngklawiwrwmkbphaphid thaphaphnithukprbprungaekikhhruxepliynaeplngcakedim khxmulbangxyangcayngkhngimepliynaeplngehmuxnphaphthithukprbprungaekikhnn error0 ekhathungcak https th wikipedia org wiki ifl Optical greysquares arp jpg, wikipedia, วิกิ หนังสือ, หนังสือ, ห้องสมุด,
