Re: Coffee Beans -- (I see the face, but I don't know WHO it is.)

On Fri, 11 Jul 2025 08:33:30 GMT, James Dow Allen wrote:

Couldn't see "squat."  Wondered if it was a stereoscopic image like
https://www.hidden-3d.com/index.php?id=gallery&oid=&pk=464 (and thought
it would be very clever to design such from coffee beans!)
but No.
 

Just beans for me...

How many of you can focus easily to see the 3-D image embedded in a
stereoscopic image?  Some people seem to have great difficulty.

Generally I can.

I did make a few autostereograms a long time ago (forty years?) on an
Atari ST microcomputer using software described in a paper from Bradford
University(?), UK. The printed paper arrived in the post - it was before
the Internet became ubiquitous.

The image size, image resolution, viewing distance, pattern repetition
distance and pixel offset need to be such that it is comfortable for a
viewer to see the embedded image. The viewer needs two reasonably
functioning eyes too.

Web based autostereograms probably should have a recommended screen size /
resolution and viewing distance. What works on a big screen isn't going to
comfortably work on a phone's small screen.

--
David Entwistle