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Black and white photo that looks like colored photo illusion

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tim
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Black and white photo that looks like colored photo illusion

Post#1 by tim » 16 Aug 2019, 15:43


A friend shared this with me on facebook since he thought I'd be interested in this kind of stuff (Which I am).
https://petapixel.com/2019/07/31/this-b ... jXiT3IyZfc
aka Tin
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Wallace
Global Moderator

Post#2 by Wallace » 16 Aug 2019, 18:14


We have amazing brains. :trampoline:
Image
1

Krikor
Forum Member

Post#3 by Krikor » 16 Aug 2019, 22:33


Interesting how our eyes can see what doesn't exist when the brain tries to standardize the information it receives.
I wanted to play a little with this information.
Attachments
Black and white or color ?
Black and white or color ?
Colorassi.png (444.57 KiB) Viewed 5900 times
"I feel that in both art and music, it's not the success that matters but the pleasure it gives you. Focus on the pleasure and the learning will come naturally." - Brian Weston
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neurolurker
Forum Member

Post#4 by neurolurker » 17 Aug 2019, 07:28


Krikor, if you don't mind my asking, how were you able to apply the color grid over a desaturated image? I tried following Øyvind Kolås notes about entering text in Filters: Generic: GEGL Graph ... id=foo saturation scale=0.0 over aux=[ ref=foo saturation scale=2.5 opacity aux=[ color value="rgb(0.35,0.35,0.35)" newsprint period=23 pattern=cross color-model=white-on-black angle=45 ] crop aux=[ ref=foo ] ] ... but there seems to be no result after a variety of alternative layer attempts. And in Windows 10 GIMP 10.2.12 the GEGL Graph plugin itself seems to be inactive in some way, even though it is present in GIMP. I would be grateful for any guidance on what procedure sequence worked for you.
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tim
GL Blogger

Post#5 by tim » 17 Aug 2019, 12:58


neurolurker wrote:
17 Aug 2019, 07:28
Krikor, if you don't mind my asking, how were you able to apply the color grid over a desaturated image? I tried following Øyvind Kolås notes about entering text in Filters: Generic: GEGL Graph ... id=foo saturation scale=0.0 over aux=[ ref=foo saturation scale=2.5 opacity aux=[ color value="rgb(0.35,0.35,0.35)" newsprint period=23 pattern=cross color-model=white-on-black angle=45 ] crop aux=[ ref=foo ] ] ... but there seems to be no result after a variety of alternative layer attempts. And in Windows 10 GIMP 10.2.12 the GEGL Graph plugin itself seems to be inactive in some way, even though it is present in GIMP. I would be grateful for any guidance on what procedure sequence worked for you.
Don't know how Krikor did it but this is how I did it.
1. Over saturate colors of an image (original layer).
2. Render a grid.
3. Rotate grid to about 45 degrees.
4. Alpha to selection grid, selection invert.
5. select original layer, desaturate.
6. Turn off visibility of grid.
aka Tin
:tree_02:
Tin's: Favorite Index | Simple Art === fb4yt video search | fb4yt recent video views report
Lottery numbers from image | Interested Members in TLF
Paying for hosting is to support my hobby, and donating money made from ads to The Red Cross.
         
0

Krikor
Forum Member

Post#6 by Krikor » 17 Aug 2019, 19:19


neurolurker, basically I did as Tim described.
01.The original picture in layer 01.
02. New transparent layer over the original image
**03. Apply - Filter - Render - Pattern - Grid, on the transparent layer
04. In this layer, Alpha to Selection (Selecting the grid created)
05. Select - Invert (Ctrl + I)
*06. Select the original layer, duplicate this layer, and on the duplicate layer press delete.
07. select the original layer, duplicate it, desaturate.
08. Turn off the visibility of all layers but the desaturated one and that on step 06.

I may not have done it exactly in this sequence or this way, but it was basically the technique I used.

P.S:
* Ah, in the layer with the colored grid I suggest applying a saturation.

** ehhh, After step 03 and before step 04, I rotated the grid 30º (Rotate Toll - Shift+R )
"I feel that in both art and music, it's not the success that matters but the pleasure it gives you. Focus on the pleasure and the learning will come naturally." - Brian Weston
0

Pat625
Tutorial Creator

Post#7 by Pat625 » 17 Aug 2019, 21:48


Tin, that is another neat,interesting phenomenon that proves that the brain and eyes do not always interpret things the same, such as watching a car go by and the wheels look as they are spinning backwards!

Thank you for sharing with us.
0

Pat625
Tutorial Creator

Post#8 by Pat625 » 18 Aug 2019, 01:58


I just had to play with this! I did make a mistake, but decided to leave it to show the difference between the outcome and the desaturated layer. When I rotated the grid, I forgot to check that the entire photo was covered. You can see this now that I have scaled the end result. Amazing! Look at the top right and bottom left for the difference.
Optical Illusion.jpg
Optical Illusion.jpg (135.09 KiB) Viewed 5839 times
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Pat625
Tutorial Creator

Post#9 by Pat625 » 18 Aug 2019, 02:01


Tin, this is posted in Anything goes, but shouldn't the procedure get posted in "Tutorials"?
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tim
GL Blogger

Post#10 by tim » 18 Aug 2019, 03:12


It can I guess now that we have steps reproducing the effect.
aka Tin
:tree_02:
Tin's: Favorite Index | Simple Art === fb4yt video search | fb4yt recent video views report
Lottery numbers from image | Interested Members in TLF
Paying for hosting is to support my hobby, and donating money made from ads to The Red Cross.
         
0


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