How Our Eyes Read Color
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How Our Eyes Read Color

The Scientific Justification of Neo-impressionist Color Theory

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How Our Eyes Read Color
Michel Eugene Chevreul

Last semester, I wrote a paper discussing the impact scientists Michel Eugène Chevreul and Ogden Rood had on the lead neo-impressionist artists Georges Seurat, Paul Signac, and Camille Pissarro. Through the analysis of Eugène Chevreul’s The Law of Simultaneous Contrast and Harmonization of Colors (1885) and Ogden Rood’s Modern Chromatics (1879), conclusions can be drawn on how their principles impacted the neo-impressionists’ paintings in the development of divisionism.

Basically, it is all about how are eyes see colors in relationship to other colors. Instead of giving you the twenty-five-page paper that would bore you to death, I am just going to give you the fun and interesting stuff!

The neo-impressionists used the scientific principles of color to develop the painting method known as divisionism. This is the dividing and recomposing of color using dots of chromatic analogous and complementary colors to create the optical impression of the intended color when viewed at a certain distance. As an example, you can see how our eyes optically blend colors when viewing a neo-impressionist painting up close versus far away.

Divisionism was loosely based upon Chevreul’s law of simultaneous contrast, successive contrast, and mixed contrast.


The Law of Simultaneous Contrast states that if we look at two strips of the same color at the same time next to different colors of the same tone side by side, the eye perceives changes in intensity of color and optically mixes the colors as well. Here is an example:


As you can see, the red appears brighter in the blue square, even though bother circles are the same hue.

Notice how are eye perceives the "x" differently in juxtaposition of each color!

Next, Successive contrast occurs the moment at which the eye having stared at a color object for a length of time, upon turning the gaze away sees an after image of those objects in their complementary colors. Again, here is an example:


Look at the image of the flag for 30 seconds before looking at the black x. Your eyes should see an after image in complementary colors!

Last, mixed contrast happens when the eye perceives the complementary color of the object first seen and a new colored object at the same time. Here is an exaggerated example. This is most noticeable at the edges between colors.



Mixed contrast is very noticeable in Seurat's Bathers at Asnières. ca. 1884.


Ogden Rood’s writing and color diagrams impacted artist’s understanding of additive color mixing versus subtractive color mixing.

Neo-impressionists believed optical mixture to be superior to mixing colors on the palette. They attributed this to the subtractive quality of pigments, as opposed to the additive qualities of light. The idea is that the more pigments that are mixed, the less light that is reflected. Neo-impressionists found justification of their beliefs in Rood’s spinning disc experiments46. In them, Rood demonstrates if one spins a color wheel, instead of the wheel appearing black, it appears white instead because of the blurring of the colored wavelengths together. Thus came the belief of a hierarchy of optical mixture to palette mixing.



At first, it was assumed that the neo-impressionist paintings actually reflected the principles perfectly, but later in 1987, historians such as Alan Lee and John Gage began to disagree because of the subjectivity of the artists. It can be argued that the artists did not adhere directly to these scientific formulas and maybe did not even fully understand the principles or that the representation of these principles in the paintings is incorrect and exaggerated, but the scientific essays gave them inspiration and understanding to create the painting technique of divisionism. The scientific justification of the technique allowed it to transcend style and become a movement.

Nor can one deny their beauty!


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This article has not been reviewed by Odyssey HQ and solely reflects the ideas and opinions of the creator.
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