Go Back   Freethought Forum > The Marketplace > The Sciences

Reply
 
Thread Tools Display Modes
  #51  
Old 03-15-2014, 11:53 AM
-FX-'s Avatar
-FX- -FX- is offline
Forum gadfly
 
Join Date: Feb 2011
Location: In your head
Gender: Male
Posts: MMCLI
Blog Entries: 1
Default Re: Optical illusions

zombie thread
Reply With Quote
  #52  
Old 03-26-2024, 03:32 PM
-FX-'s Avatar
-FX- -FX- is offline
Forum gadfly
 
Join Date: Feb 2011
Location: In your head
Gender: Male
Posts: MMCLI
Blog Entries: 1
Default Re: Optical illusions

Many old threads, like this one, no longer have any of the images showing. Which makes this post quite fitting to end the thread

Quote:
Originally Posted by Ymir's blood View Post
I've got a similar one saved to my hard drive, "All is Vanity", by C. Allan Gilbert, I found it at Wikipedia a few weeks ago.
__________________
"Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and ask yourself, "Is it reasonable?""

- Richard P. Feynman
Reply With Quote
  #53  
Old 03-26-2024, 04:36 PM
LarsMac's Avatar
LarsMac LarsMac is offline
Pontificating Old Fart
 
Join Date: Nov 2012
Location: On the Road again
Gender: Male
Posts: MMMDCLXIII
Default Re: Optical illusions

So, do you wander graveyards at night, digging people up to make sure that they are dead?
__________________
“Thinking is the hardest work there is, which is the probable reason why so few engage in it.” —Henry Ford
Reply With Quote
Thanks, from:
Crumb (03-26-2024)
  #54  
Old 03-26-2024, 07:28 PM
JoeP's Avatar
JoeP JoeP is online now
Solipsist
 
Join Date: Jul 2004
Location: Kolmannessa kerroksessa
Gender: Male
Posts: XXXVMMDCX
Images: 18
Default Re: Optical illusions

Do NOT give him ideas.
__________________

:roadrun:
Free thought! Please take one!

:unitedkingdom:   :southafrica:   :unitedkingdom::finland:   :finland:
Reply With Quote
Thanks, from:
Crumb (03-26-2024)
  #55  
Old 03-27-2024, 02:25 AM
-FX-'s Avatar
-FX- -FX- is offline
Forum gadfly
 
Join Date: Feb 2011
Location: In your head
Gender: Male
Posts: MMCLI
Blog Entries: 1
Default Re: Optical illusions



Title text: (c) You can have a scooter when you pay for it yourself, and (d) if you can't learn to start a new thread rather than responding to an old one, you'll be banned. [thread locked by moderator]
__________________
"Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and ask yourself, "Is it reasonable?""

- Richard P. Feynman
Reply With Quote
Thanks, from:
ceptimus (03-27-2024)
  #56  
Old 06-08-2024, 08:34 PM
Crumb's Avatar
Crumb Crumb is offline
Adequately Crumbulent
 
Join Date: Jan 2005
Location: Cascadia
Gender: Male
Posts: LXMMDCXIX
Blog Entries: 22
Images: 355
Default Re: Optical illusions

Apparently both the these faces are the same color.

6yr7uqwpsc5d1.png
__________________
:joecool2: :cascadia: :ROR: :portland: :joecool2:
Reply With Quote
Thanks, from:
Ari (06-08-2024), ceptimus (06-08-2024), Ensign Steve (06-08-2024), JoeP (06-08-2024), Pan Narrans (06-27-2024)
  #57  
Old 06-08-2024, 09:29 PM
Ari's Avatar
Ari Ari is offline
I read some of your foolish scree, then just skimmed the rest.
 
Join Date: Jan 2005
Location: Bay Area
Gender: Male
Posts: XMCMLVII
Blog Entries: 8
Default Re: Optical illusions

I thought it would be amusing to break it apart, the top is the original, the second has the hair and background copied from the left to the right, the third has only the inverted contour lines copied over from the left to the right, and finally the fourth has the hair, background and inverted contour lines copied from left to right.

Attached Images
File Type: png Grey Faces.png (100.9 KB, 34 views)
Reply With Quote
Thanks, from:
ceptimus (06-08-2024), Crumb (06-09-2024), Ensign Steve (06-08-2024), Pan Narrans (06-27-2024)
  #58  
Old 06-08-2024, 10:05 PM
Ari's Avatar
Ari Ari is offline
I read some of your foolish scree, then just skimmed the rest.
 
Join Date: Jan 2005
Location: Bay Area
Gender: Male
Posts: XMCMLVII
Blog Entries: 8
Default Re: Optical illusions

To double post because while the inverted contour lines seem to be doing a lot of heavy lifting, that doesn't actually explain it.

Both the white and black faces 'exist' but in different parts of the data. Here I've constrained the top image from 0-128 and the bottom image from 128-256, and it's easy to see that when unconstrained the brightest value on the left is around 128 and on the right the darkest value is also around 128.
Attached Images
File Type: png constrained faced.png (37.0 KB, 33 views)
Reply With Quote
Thanks, from:
Ensign Steve (06-08-2024)
  #59  
Old 06-08-2024, 10:45 PM
Ensign Steve's Avatar
Ensign Steve Ensign Steve is offline
California Sober
 
Join Date: Jul 2004
Location: Silicon Valley
Gender: Bender
Images: 66
Default Re: Optical illusions

Wait, so are the eyes the same? Other than the contour lines, are the whites and the blues of the eyes unchanged? Or just the blues? Either way, yes the contour lines are doing a lot of the work.
__________________
:kiwf::smurf:
Reply With Quote
  #60  
Old 06-20-2024, 05:34 PM
slimshady2357's Avatar
slimshady2357 slimshady2357 is offline
forever in search of dill pickle doritos
 
Join Date: Jul 2004
Posts: VMCCI
Blog Entries: 6
Images: 52
Default Re: Optical illusions

Supposedly these lines area all straight even though it appears like there a bulge in the middle.

GQeQJNzaIAATONH.jpeg
__________________
Reply With Quote
Thanks, from:
Ari (06-20-2024), BrotherMan (06-21-2024), ceptimus (06-20-2024), Crumb (06-21-2024), JoeP (06-20-2024)
  #61  
Old 06-20-2024, 05:52 PM
Ensign Steve's Avatar
Ensign Steve Ensign Steve is offline
California Sober
 
Join Date: Jul 2004
Location: Silicon Valley
Gender: Bender
Images: 66
Default Re: Optical illusions

I would describe it as "all the cells are the same size, but the central ones look bigger."

Curiously, I don't see the illusion in the thumbnail, only in the full-size picture.
__________________
:kiwf::smurf:
Reply With Quote
Reply

  Freethought Forum > The Marketplace > The Sciences


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

 

All times are GMT +1. The time now is 10:07 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Page generated in 0.28542 seconds with 15 queries