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Style in Neo Impressionist paintings

Divisionism, also called chromoluminarism, is the characteristic style in Neo Impressionist painting defined by the separation of colors into individual dots or patches that interact optically. By requiring the viewer to combine the colors optically instead of physically mixing pigments, Divisionists believed that they were achieving the maximum luminosity scientifically possible. Georges Seurat founded the style around 1884 as chromoluminarism, drawing from his understanding of the scientific theories of Michel Eugène Chevreul, Ogden Rood and Charles Blanc, among others. Divisionism developed along with another style, Pointillism, which is defined specifically by the use of dots of paint and does not necessarily focus on the separation of colors.

Divisionism is the technique of painting separate dots or patches of different colors in close proximity that interact optically in the viewer's perception to generate more luminous colors. The paints are not actually mixed but viewed close together, so the separate colors of light reflected by the paints mixes in the eye and brain; the process is called additive mixing and is also used by computer monitors. This is different from mixing different paints together to produce a new color by subtractive mixing, which is also how laser printers produce colors. Impressionism originated in France in the 1870s, and is characterized by the use of quick, short, broken brushstrokes to accurately capture the momentary effects of light and atmosphere in an outdoor scene. The Impressionists sought to create an "impression" of a momentary scene as perceived by the viewer, rather than a mechanically precise replication of the scene. Divisionism, also known as Pointillism, developed from Impressionism in the 1880s. The Divisionists used a technique of placing small, distinct dots of color next to one another on the canvas, rather than mixing the colors on the palette. This created a more vibrant and dynamic effect, but also required a higher level of skill and precision. Neo Impressionism emerged in the late 19th century, used more precise and geometric shapes to build compositions and was strongly influenced by the scientific study of color theory and optical color effects, to create a more harmonious and luminous painting. Scientists or artists whose theories of light or color had some impact on the development of Divisionism include Charles Henry, Charles Blanc, David Pierre Giottino Humbert de Superville, David Sutter, Michel Eugène Chevreul, Ogden Rood and Hermann von Helmholtz. By 1884, with the exhibition of his first major work, Bathers at Asnières, as well as croquetons of the island of Île de la Jatte, his style began taking form with an awareness of Impressionism, but it was not until he finished La Grande Jatte in 1886 that he established his theory of chromoluminarism. In fact, La Grande Jatte was not initially painted in the Divisionist style, but he reworked the painting in the winter of 1885–86, enhancing its optical properties in accordance with his interpretation of scientific theories of color and light.

Charles Blanc's Grammaire des arts du dessin introduced Seurat to the theories of color and vision that would inspire chromoluminarism. Blanc's work, drawing from the theories of Michel Eugène Chevreul and Eugène Delacroix, stated that optical mixing would produce more vibrant and pure colors than the traditional process of mixing pigments. In 1907 Metzinger and Delaunay were singled out by the critic Louis Vauxcelles as Divisionists who used large, mosaic like 'cubes' to construct small but highly symbolic compositions. Both artists had developed a new sub style that had great significance shortly thereafter within the context of their Cubist works. Piet Mondrian, Jan Sluijters and Leo Gestel, in the Netherlands, developed a similar mosaic like Divisionist technique circa 1909. The Futurists later (1909–1916) would adapt the style, in part influenced by Gino Severini's Parisian experience (from 1907), into their dynamic paintings and sculpture.

The influence of Seurat and Signac on some Italian painters became evident in the First Triennale in 1891 in Milan. Spearheaded by Grubicy de Dragon, and codified later by Gaetano Previati in his Principi scientifici del divisionismo of 1906, a number of painters mainly in Northern Italy experimented to various degrees with these techniques. Pellizza da Volpedo applied the technique to social (and political) subjects; in this he was joined by Morbelli and Longoni. Among Pellizza's Divisionist works were Speranze deluse (1894) and Il sole nascente (1904). It was, however, in the subject of landscapes that divisionism found strong advocates, including Giovanni Segantini, Gaetano Previati, Angelo Morbelli and Matteo Olivero. Further adherents in painting genre subjects were Plinio Nomellini, Rubaldo Merello, Giuseppe Cominetti, Camillo Innocenti, Enrico Lionne and Arturo Noci. Divisionism was also in important influence in the work of Futurists Gino Severini (Souvenirs de Voyage, 1911); Giacomo Balla (Arc Lamp, 1909); Carlo Carrà (Leaving the scene, 1910); and Umberto Boccioni (The City Rises, 1910).

Divisionism quickly received both negative and positive attention from art critics, who generally either embraced or condemned the incorporation of scientific theories in the Neo Impressionist techniques. For example, Joris Karl Huysmans spoke negatively of Seurat's paintings, saying "Strip his figures of the colored fleas that cover them, underneath there is nothing, no thought, no soul, nothing". Leaders of Impressionism, such as Monet and Renoir, refused to exhibit with Seurat, and even Camille Pissarro, who initially supported Divisionism, later spoke negatively of the technique. For example, one of these misconceptions can be seen in the general belief that the Divisionist method of painting allowed for greater luminosity than previous techniques. Additive luminosity is only applicable in the case of colored light, not juxtaposed pigments; in reality, the luminosity of two pigments next to each other is just the average of their individual luminosities. Furthermore, it is not possible to create a color using optical mixture that could not also be created by physical mixture. Logical inconsistencies can also be found with the Divisionist exclusion of darker colors and their interpretation of simultaneous contrast.