Optical Illusion

00111111 · **Posted:** Tue Aug 04, 2020 3:52 am **(#1)**

Do you see the image moving.

jpg, not a gif

sallyanne · **Posted:** Tue Aug 04, 2020 5:06 am **(#2)**

Is cool

Nidhogg · **Posted:** Tue Aug 04, 2020 6:03 am **(#3)**

Anomalous motion illusion, I'd be surprised if that was not made by Akiyoshi Kitaoka.
Try to spend few hours on the site without feeling dizzy lol.

http://www.ritsumei.ac.jp/~akitaoka/index-e.html

oldmangrumpy · **Posted:** Tue Aug 04, 2020 6:13 am **(#4)**

Nidhogg - thanks for the link; spent 5 minutes there, got dizzy so bookmarked it for another visit :hehe

00111111 · **Posted:** Tue Aug 04, 2020 6:15 am **(#5)**

Nidhogg wrote:

I'd be surprised if that was not made by Akiyoshi Kitaoka.

He was involved :bigthup

sallyanne · **Posted:** Tue Aug 04, 2020 6:51 am **(#6)**

Did one the other day in gimp or gmic. cannot find where though now

Nidhogg · **Posted:** Tue Aug 04, 2020 7:08 am **(#7)**

sallyanne wrote:

Did one the other day in gimp or gmic. cannot find where though now

G'mic/Rendering/Kitaoka Spin Illusion.

I think scintillating grid illusion is also somewhere in G'mic, but I can't find it right now.
Or it may be that I created it with some of the pattern filters by accident.

racer-x · **Joined:** Apr 15, 2017 **Posts:** 1826

Gave me an idea for some glasses....

Attachment:

cool-glasses.jpg [ 176.02 KiB | Viewed 7258 times ]

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12531

Yes; I toyed with this in the past.

https://www.flickr.com/photos/34520999@ ... 58/sizes/o

Nidhogg · **Posted:** Tue Aug 04, 2020 12:44 pm **(#10)**

Nice hyper droste lyle, that would be great tunnel slide in a fun house. :hehe

I like the glasses too, much better than the basic spiral glasses.

sallyanne · **Posted:** Tue Aug 04, 2020 6:24 pm **(#11)**

I did mention last night although my internet obviously went off again before it posted, is that I found one and it showed as the default before I used any settings. Not sure where now but some of it is on one of my text effects.
However I did this last night using 2 GMIC filters - the one Nidhogg mentioned and logarithmic distortion

sallyanne · **Posted:** Wed Aug 05, 2020 9:26 am **(#12)**

Another

Nidhogg · **Posted:** Wed Aug 05, 2020 10:12 am **(#13)**

sallyanne, thank you for introducing logarithmic distortion :jumpclap

I have not used it before.
A hint, you need to use specific colors to make the Kitaoka optical illusion to seem to be shifting.
That's why the filter default uses dark purple and green, blue and yellow also works.

Attachment:

Kitaoka-LogarithmicDist.png [ 1.1 MiB | Viewed 6148 times ]

sallyanne · **Posted:** Wed Aug 05, 2020 11:03 am **(#14)**

Some one will figure it out. The one I made was same colours. I htink I did a chess board or grid first and a couple other filters after. I'll probably keep trying now until I get it again - maybe another day though now.

sallyanne · **Posted:** Thu Aug 06, 2020 8:27 am **(#15)**

sallyanne · **Posted:** Mon Aug 24, 2020 6:50 am **(#16)**

Psychobily whirl & pinched cubed

Steve · **Joined:** Dec 26, 2014 **Posts:** 198

Playing with a script making coloured designs I came across an image that seemed to vibrate (or it might be my tired old eyes), reduced here to green and magenta

Attachment:

green and magenta.png [ 63.16 KiB | Viewed 4958 times ]

sallyanne · **Posted:** Wed Aug 26, 2020 11:32 am **(#18)**

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12531

Had just enough inspiration (but especially time) to dig up this relatively old thread. lolololol

Hope you all are doing great. Still, have to hit the hay soon for day 2 of my 4 day work week. Hope you all have a great weekend.

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12531

OK; inspired by this article, I created the following wobble stone illusion (they call it bubble but to me it looks like stones). Can click here for texture reference. You may not see the wobble at first but it will show up if you stare for a bit (or drink a lot of booze; your choice). lol