Nowadays we are used to digital photography and have totally forgotten that color photography is something relatively new.
According to Wikipedia:
Color photography is photography that uses media capable of reproducing colors. By contrast, black-and-white (monochrome) photography records only a single channel of luminance (brightness) and uses media capable only of showing shades of gray. In color photography, electronic sensors or light-sensitive chemicals record color information at the time of exposure. This is usually done by analyzing the spectrum of colors into three channels of information, one dominated by red, another by green and the third by blue, in imitation of the way the normal human eye senses color.
We first saw the color photographs around 1907 with The Autochrome plate is introduced and becomes the first commercially successful color photography product. Below you can see the first color photos taken in Greece (1930). “H/T”: vintag
ca. August 1928, Athens, Greece — Portrait of a woman wearing a Macedonian-style costume — Image by © Maynard Owen Williams/National Geographic Society/Corbis