Color Assimilation Grid Illusion

The visual experiment that went along with my previous post went viral, the one that went viral was an already lossily compressed JPEG that has also gone through further cycles of viral degradation by scalings and further JPEG recompressions. This post contains high quality losslessly compressed imagery that is suitable for illustrating the illusion; these bits of media should be used if media is reporing on the illusion.

I have also created the above video, showing how it works on moving images, and added an operation to GEGL and I've decided to call it "Color Assimilation Grid".

https://gitlab.gnome.org/GNOME/gegl/commit/5048642f967dcd920c4d681d00badce268b19d53

If one is building GEGL and GIMP from source, or otherwise following git master, the operation is already available - it will become available in stock GIMP versions with the next GIMP-2.10 release as well as in any upcoming development snapshot for 3.0.

I came up with this illusion by experimenting with different patterns - and recently having worked on improvements for the saturation operation and being inspired by other illusions, and most recently David Novick color illusions  in particular the ones like this Munker illusion with Tennis balls.

I've found that the grid works best. And as some have commented, this grid is similar to the red nets used by orange farmers.

This is not the exactly same as the way JPEG compression works, since in JPEG compression the lower resolution color signal is present for in every reconstructed pixel, in this illusion the reconstruction is happening in our eyes/mind - but it uses the same principle that Chroma Subsampling does, that luminance is a lot more important than the chroma for our visual perception.

The raster of dots gives a nice analogy to halftoning as used in print, where color assimilation aids the optical mixture of colors that already happens before our visual system gets involved.

It also works well with lines, but we need a tighter spacing than if we use a grid.

And a Lorem Ipsum example, if one were to integrate the illusion as part of a graphic design, one could do well in choosing fragments of text fitting within only the areas that are in color (or add a slight brightness boost - to make it visible also in non colorful areas of the source image):

Here are the corresponding original, and de-saturated / grayscale versions:



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