Jules Bastien-Lepage in the context of En plein air

Umber is a natural earth pigment consisting of iron oxide and manganese oxide; it has a brownish color that can vary among shades of yellow, red, and green. Umber is considered one of the oldest pigments known to humans. Umber's advantages are its highly versatile color, warm tone, and quick drying abilities. While some sources indicate that umber's name comes from its geographic origin in Umbria, other scholars suggest that it derives from the Latin word umbra, which means "shadow". The belief that its name derives from the word for shadow is fitting, as the color helps create shadows. The color is primarily produced in Cyprus. Umber is typically mined from open pits or underground mines and ground into a fine powder that is washed to remove impurities. In the 20th century, the rise of synthetic dyes decreased the demand for natural pigments such as umber.

Sven Richard Bergh (28 December 1858 – 29 January 1919) was a Swedish painter, art critic and museum manager. Despite many years in France, he remained unattracted to Impressionism, preferring instead the Naturalism of painters such as Jules Bastien-Lepage. He also rejected the idea of creating landscapes en plein aire. Bergh is also notable for coining the term stämningsmåleri or "mood painting", in an 1896 essay about breaking with realism and embracing a new subjective style of painting towards the fin de siècle.