From the beginning of human history, people have drawn images of views on a variety of media including cave walls, tomb interiors, papyrus, stone and paper. It took the invention and development of photography to move from sketches or drawings and the application of prints to paper to achieve the more realistic postcard views that we are accustomed to today.
1839 Photography invented by Louis-Jacques
Mande Daguerre, the world's first practical photographic
process, called The daguerreotype produced an image on a
silver-coated copper plate and was used extensively until 1860
1841 The quest for photographs on paper started with Calotypes (a positive
photographic image on salted paper from a negative produced in the same
manner) in .
1850-1910 Albumens (a positive
print on paper coated with egg whites produced from a glass negative
)
1851-1925 Stereographic style of presenting photographs for stereograph viewing.
1854- 1865 Ambrotypes (a negative image on a glass plate viewed as a positive by the addition of a black backing)
1854-1905 Cartes de visite (style of photographic printing on paper)
1856-1867 Tintypes ( a negative image on a thin iron plate viewed as a positive by the addition of an undercoating of black Japan varnish)
1863-1920 Cabinet card style of presenting photographs
1873-Dry plate photography invented by Richard Maddox and improved by Charles Bennett and then by George Eastman
1873 First Government Postcard (UX1) issued and first view postal card printed privately. Image shown below
1882 Platinum print photography popularized
1893 Velox photography (using a gelatin chloride paper invented
1898, George Hollister, a postcard publisher in New York
City produced a series of 26 postcards of Greater New York with a pasted photograph
on each postcard. This process is referred to as "tipping in." It was a
printed postcard with a printed frame in which the photograph was
carefully placed and pasted down.

(George Hollister, printer; Number 23, The Speedway and Washington Bridge, N.Y.)
1899 The first known Real Photo Postcard finally made its appearance
1902 Velox
photo paper marketed. This easy to use developing paper, was
seriously marketed on heavy stock to
prevent curling with a pre printed postcard back.
1903 Kodak introduced the No. 3A, an
inexpensive Folding Pocket Kodak. The camera, designed for postcard-size film,
allowed the general public to take photographs and have them printed on
postcard backs. They are usually the same size as standard vintage
postcards (3-1/2" x 5-1/2").
1906
Kodak offered a fee based service where they would process
and print real photo postcards adding greatly to their convenience and
popularity.Also known by the acronym "RPPC".