14. June 2006

Optical Illusion: Colourful Black and White Image

Human perception is a fascinating thing to fool around with. There are numerous illusions which make you see things that are not really there (without using hallucinogenic drugs).

One of the most intriguing optical illusions is the colourful black and white image.

Just stare at the dot in the picture below for 15-30 seconds (the longer the better). Then move with your mouse over the image, but keep focusing the dot. You will see a b/w image, but it appears like a colour photo. If you move your focus from the dot, the illusion collapses.

(Note: JavaScript must be activated; it might not work in feed readers)


You can easily create this illusion yourself. John Sadowski posted a tutorial for making the two images from any colour image. He even included a Photoshop action which automates the process (english Photoshop only, use my adapted action if you have a german photoshop)

You can then use my simple roll-over-generator to create the rollover-effect.

Have fun!

(via Boing Boing)

Topics: bwcoloureyeillusionopticalPhotoshop


  1. This article is also available in German: Optische Täuschung

    Comment by Flo — 9. August 2006 @ 1:30

  2. Pretty cool…looking forward to making my own.

    Comment by John — 10. April 2007 @ 2:11

  3. A really cool optical illusion!!!!

    Comment by Yenli — 28. April 2007 @ 11:06

  4. hahaha oo!!!aztig!!ngannnu kaha??aw!!

    Comment by gogo — 19. October 2007 @ 8:30

  5. not very good i focused on the dot but i did not find that the black and white picture turned into a coloured picture. SO THAT MEANS I HATE THIS TRICK OF YOURS!!!!

    Comment by priya — 12. June 2008 @ 20:43

  6. impressive
    you need to still stared at the dot when it becomes black and white.

    Comment by viewer82 — 13. February 2009 @ 16:17

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