Home | Blog | Software | Reviews and Features | Forum | Help | Donate | About us
topbanner_forum
  *

avatar image

Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
  • October 19, 2017, 03:16 PM
  • Proudly celebrating 10 years online.
  • Donate now to become a lifetime supporting member of the site and get a non-expiring license key for all of our programs.
  • donate

Author Topic: An Optical Illusion  (Read 2818 times)

Renegade

  • Charter Member
  • Joined in 2005
  • ***
  • Posts: 13,243
    • View Profile
    • Donate to Member
An Optical Illusion
« on: February 15, 2011, 04:43 AM »
I was working on a kind of tiling problem, I wanted to visually compare some sizes, and mocked up 4 bars in Photoshop:

Screenshot - 2011-02-15 , 9_39_18 PM.png

In the top corner you can see 4 vertical bars, and 4 bars behind them.

Anyways, just a stupid little thing that I though might amuse someone.

f0dder

  • Charter Honorary Member
  • Joined in 2005
  • ***
  • Posts: 9,100
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #1 on: February 15, 2011, 04:54 AM »
Cute :)

mouser

  • First Author
  • Administrator
  • Joined in 2005
  • *****
  • Posts: 37,487
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #2 on: February 15, 2011, 05:40 AM »
What am I supposed to see?

worstje

  • Honorary Member
  • Joined in 2009
  • **
  • Posts: 580
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #3 on: February 15, 2011, 05:55 AM »
In the top corner you can see 4 vertical bars, and 4 bars behind them.

mouser

  • First Author
  • Administrator
  • Joined in 2005
  • *****
  • Posts: 37,487
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #4 on: February 15, 2011, 06:02 AM »
I guess the idea was we are supposed to perceive 4 *horizontal* bars behind the vertical ones.  Didn't really happen for me. meh.

mahesh2k

  • Supporting Member
  • Joined in 2007
  • **
  • Posts: 1,417
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #5 on: February 15, 2011, 08:44 AM »
I want to go creative with this, add more 4 more black bars and let this be visualizer.  :D

Renegade

  • Charter Member
  • Joined in 2005
  • ***
  • Posts: 13,243
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #6 on: February 15, 2011, 08:48 AM »
I want to go creative with this, add more 4 more black bars and let this be visualizer.  :D

Screenshot - 2011-02-16 , 1_47_11 AM.png


mahesh2k

  • Supporting Member
  • Joined in 2007
  • **
  • Posts: 1,417
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #7 on: February 15, 2011, 08:56 AM »
 :up:

tomos

  • Charter Member
  • Joined in 2006
  • ***
  • Posts: 10,830
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #8 on: February 15, 2011, 09:31 AM »
I guess the idea was we are supposed to perceive 4 *horizontal* bars behind the vertical ones.  Didn't really happen for me. meh.

I saw it as 4 grey bars initially - the black bars were in the foreground.
But when I read your response mouser I looked at it again (the first image) and was able to "push" the black bars into the background (which I think is how you see it).

Damn, if I look at that image too long my eyes start dancing...

mwb1100

  • Supporting Member
  • Joined in 2006
  • **
  • Posts: 1,568
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #9 on: February 15, 2011, 09:38 AM »
The bars behind bars effect didn't really hit me either, but what I see is that the light colored  squares around the black bars have a definitely different hue than the light colored squares in the rest of the image (I'm assuming that they in fact have the same color).  Maybe it's my laptop monitor, but I'm surprised no one else mentioned the effect.

bob99

  • Supporting Member
  • Joined in 2008
  • **
  • default avatar
  • Posts: 339
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #10 on: February 15, 2011, 09:52 AM »
Helps me if I tilt the screen to look perpendicular at it and remove my glasses.  I have the progressive bi-focals and just a slight up or down movement can change the focus.
 

tomos

  • Charter Member
  • Joined in 2006
  • ***
  • Posts: 10,830
    • View Profile
    • Donate to Member
Re: An Optical Illusion
« Reply #11 on: February 15, 2011, 10:00 AM »
The bars behind bars effect didn't really hit me either, but what I see is that the light colored  squares around the black bars have a definitely different hue than the light colored squares in the rest of the image (I'm assuming that they in fact have the same color).  Maybe it's my laptop monitor, but I'm surprised no one else mentioned the effect.

no, that's a known effect - the hue/tone depends on the surrounding colour(s).
I'm not sure if colour "changes" this way too, I think so though.