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Author Topic: An Optical Illusion  (Read 2610 times)

Renegade

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An Optical Illusion
« on: February 15, 2011, 04:43:53 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.
Slow Down Music - Where I commit thought crimes...

Freedom is the right to be wrong, not the right to do wrong. - John Diefenbaker

f0dder

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Re: An Optical Illusion
« Reply #1 on: February 15, 2011, 04:54:49 AM »
Cute :)
- carpe noctem

mouser

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Re: An Optical Illusion
« Reply #2 on: February 15, 2011, 05:40:55 AM »
What am I supposed to see?

worstje

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Re: An Optical Illusion
« Reply #3 on: February 15, 2011, 05:55:20 AM »
In the top corner you can see 4 vertical bars, and 4 bars behind them.

mouser

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Re: An Optical Illusion
« Reply #4 on: February 15, 2011, 06:02:29 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

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Re: An Optical Illusion
« Reply #5 on: February 15, 2011, 08:44:41 AM »
I want to go creative with this, add more 4 more black bars and let this be visualizer.  :D

Renegade

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Re: An Optical Illusion
« Reply #6 on: February 15, 2011, 08:48:19 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

Slow Down Music - Where I commit thought crimes...

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mahesh2k

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Re: An Optical Illusion
« Reply #7 on: February 15, 2011, 08:56:55 AM »
 :up:

tomos

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Re: An Optical Illusion
« Reply #8 on: February 15, 2011, 09:31:42 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...
Tom

mwb1100

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Re: An Optical Illusion
« Reply #9 on: February 15, 2011, 09:38:24 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

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Re: An Optical Illusion
« Reply #10 on: February 15, 2011, 09:52:12 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

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Re: An Optical Illusion
« Reply #11 on: February 15, 2011, 10:00:52 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.
Tom