Those posters

[Baldrick]

What is the name given to those posters that display one image and with a little softening and staring, present another image?  All the rage about 10 years ago.

 

I've tried 'Eye twisters', but that's not it.  A free prize of "Feeling really good" to the person who has the right answer. 

Many thanks

[j2buttonsw]

Magic eye? http://www.magiceye.com/

[dafyd]

they're called 'lenticular' images - there's a guide to how they work at http://www.shortcourses.com/how/lenticular/lenticular.htm.

 

Incidentally, they seem to be making a reappearance in bus-shelter adverts...

[LeMarchand]

"Lenticular" images are those sort of things you get on kids' cards where if you alter the angle of viewing, the picture changes (due to the printing process).

 

The ones where you "unfocus" your eyes to see a hidden 3D image are called "stereograms" (or more commonly - as j2buttonsw says - "Magic Eye").

[Baldrick]

Hi folks

 

Thanks for your answers - Ooh, it takes me back!

 

Anyway, for those of you who are interested, have a look at http://www.vision3d.com/ as well.

Many thanks to you all

Baldrick

[Dacetine]

They are called "autostereograms"

[flanker]

And it is still a constant cause of frustration that I have never been able to do a single one.