<P> En plein air (French pronunciation: ​ (ɑ̃ plɛn ɛːʁ), French for outdoors, or plein air painting) is the act of painting outdoors . This method contrasts with studio painting or academic rules that might create a predetermined look . </P> <P> Artists have long painted outdoors, but in the mid-19th century, working in natural light became particularly important to the Barbizon school, Hudson River School, and Impressionists . </P> <P> In 1830, the Barbizon School in France, inspired by John Constable, enabled artists like Charles - François Daubigny and Théodore Rousseau to more accurately depict the appearance of outdoor settings in various light and weather conditions . In the late 1800s, the en plein air approach was incorporated with the impressionists' style, and artists such as Claude Monet, Pierre - Auguste Renoir, Frédéric Bazille, and Edgar Degas began creating their work outdoors . From France, the movement expanded to America, starting in California then moving to other American locales notable for their natural light qualities, including the Hudson River Valley in New York . </P>

Impressionist paintings that were produced outdoors and not in the studio are called
find me the text answering this question