Which is darker..... square A or B ?


pschlute

Link Posted 12/11/2021 - 10:03
This is an old one, but still amazes me every time.

Which is darker ? A or B



Peter



My Flickr page

Flan

Link Posted 12/11/2021 - 11:48
When I squinted my eyes,it made me think B but youíve already suggested that 😆
Iím probably incorrect 🤦‍♂️
Interesting though , which is it?

pschlute

Link Posted 12/11/2021 - 12:16
Flan wrote:

Interesting though , which is it?

Both exactly the same shade. Open the image in any editing software and use the eyedropper or similar cursor tool.
Peter



My Flickr page

LennyBloke

Link Posted 12/11/2021 - 13:19
It's funny the difference between what you know (B is a white square and A is a grey square) and how your brain processes it. White is white so it has to be lighter
LennyBloke

pschlute

Link Posted 12/11/2021 - 13:34
LennyBloke wrote:
It's funny the difference between what you know (B is a white square and A is a grey square) and how your brain processes it. White is white so it has to be lighter

and even when you know it, you cannot tell your brain to stop playing tricks

"I saw it with my own eyes"
Peter



My Flickr page

1stEverPentax

Link Posted 12/11/2021 - 15:58
Are we talking about absolute shades or relative?

The shadow from the green cylinder impacts on 'B' but not 'A'...however on my monitor 'A' is definitely
a darker shade than 'B'...to my eyes allowing for the shadow from cylinder.

regards

Karlo

pschlute

Link Posted 12/11/2021 - 16:09
1stEverPentax wrote:
Are we talking about absolute shades or relative?

The shadow from the green cylinder impacts on 'B' but not 'A'...however on my monitor 'A' is definitely
a darker shade than 'B'...to my eyes allowing for the shadow from cylinder.

regards

Karlo

Your eyes/brain make "A" appear darker than "B". But it is an illusion.

This is what you get if you cut the two squares out in photoshop. You can also print the image and use a pair of scissors



Peter



My Flickr page

Lubbyman

Link Posted 12/11/2021 - 16:31
Alternatively, expand the image so each square is fairly large, then take either A or B and progressively shield more and more of its surroundings (use your hands or any other convenient objects). You brain gradually adjusts the shade of grey as less and less of the surrundings can be seen. A gets lighter, B gets darker. When only the square can be seen, both A and B appear the same. Or at least that's what my brain does!

It does make you wonder why there is an obsession in some quarters with things like the ultimate in sharpness or perfect white balance, when the brain is going to reprocess what the eyes see.

Steve

Helpful

pschlute

Link Posted 12/11/2021 - 17:08
Lubbyman wrote:
When only the square can be seen, both A and B appear the same. Or at least that's what my brain does!

Yes, and that is confirmed by using an eye-dropper tool in Photoshop. Both the A and B squares read the same.... R:111 G:111 B:111

They are both the identical shade of grey. Our eyes/brain tell us something different, which is quite fascinating.


Lubbyman wrote:

It does make you wonder why there is an obsession in some quarters with things like the ultimate in sharpness or perfect white balance, when the brain is going to reprocess what the eyes see.

Indeed....like I said above...."but i saw it with my own eyes"
Peter



My Flickr page
Last Edited by pschlute on 12/11/2021 - 17:10

DannyGreenis

Link Posted 12/11/2021 - 18:50
OMG my eyes tricked me.
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