How did photography change painting?
One-line takeaway
BLUF: Photography took over the jobs painting had monopolised, portrait likeness and documentary record, so painters redirected toward what a camera could not do: colour as sensation, visible brushwork, distortion, abstraction. It also handed painters cheap reference images and froze motion nobody had seen.
It is the clearest case of a new technology not killing an older craft but forcing it to find what it alone can do.
The camera took the likeness business
The daguerreotype process was announced publicly in Paris in 1839, and within two decades commercial studios were producing portraits across Europe and America at a fraction of a painted portrait's cost. Painting had earned much of its living from likeness: family portraits, topographical views, records of events and buildings. That market shrank fast. At the same time the camera gave painters new tools. Photographs served as studio reference for poses and landscapes, and photographic conventions crept into composition, notably the abrupt cropping of figures at the frame edge that shows up in Degas. Eadweard Muybridge's motion sequences from the late 1870s showed that a galloping horse's legs never form the flying-gallop pose painters had drawn for centuries.
A medium retreats to what it alone can do
The deeper principle is that a medium under competitive pressure moves toward its irreducible strengths. If a machine can produce an accurate record cheaply, then accuracy stops being a selling point and stops being what critics reward. Impressionists pushed toward optical effects of light and the physical texture of paint. Post-Impressionists and later Fauves and Cubists pushed further into colour, structure and multiple viewpoints. This is not a simple story of photography causing modernism; cheap tube paints, railway travel, Japanese prints and a changing patron class all mattered. But photography removed one large reason to paint a thing exactly as it looks, and that removal was permanent.
The same squeeze, again and again
The pattern repeats. Photography itself later faced the same pressure from cinema and then from phone cameras, and responded by developing its own art traditions, including Pictorialism's deliberately soft, painterly prints in the 1890s and the sharp-focus reaction against them. Today, painters routinely work from photographs without controversy, hyperrealists compete with the camera on its own ground as a display of skill, and generative image models are applying the same squeeze to commercial illustration that daguerreotypes applied to portrait miniatures. The consistent outcome is not extinction but specialisation: the older medium keeps the work that depends on the maker being present.
Where the story goes wrong
Common misconceptions are worth clearing. The myth is that photography instantly killed portrait painting. The reality is that the decline was gradual, portrait painting persists commercially today, and it was the miniature portrait trade that collapsed most sharply. The myth is that Impressionism was a direct reaction against photography. The reality is that Impressionists used photographs freely and were driven at least as much by new pigments, plein-air practice and Salon politics. The myth is that early photographs were objective records. The reality is that exposure times, posing, retouching and staged scenes made them constructed images from the start.