1. Photo or photography is the process, activity and art of creating still or moving pictures by recording radiation on a sensitive medium, such as a photographic film, or an electronic sensor. Light patterns reflected or emitted from objects activate a sensitive chemical or electronic sensor during a timed exposure, usually through a photographic lens in a device known as a camera that also stores the resulting information chemically or electronically. Photography has many uses for business, science, art, and pleasure.
2. Photo or photograph is a representation of a person or scene in the form of a print or transparent slide; recorded by a camera on light-sensitive material
The word “photograph” was coined in 1839 by Sir John Herschel and is based on the Greek (phos) “light” and (graphé) “representation by means of lines” or “drawing”, together meaning “drawing with light”. Traditionally, the products of photography have been called negatives and photographs, commonly shortened to photos.
3. Photo is also prefix that is attached to indicate that light is involved in that particular process.
Photography is the result of combining several technical discoveries. Long before the first photographs were made, Chinese philosopher Mo Di described a pinhole camera in the 5th century B.C.E.
Ibn al-Haytham (Alhazen) (965–1040) studied the camera obscura and pinhole camera, Daniel Barbaro described a diaphragm in 1568. Wilhelm Homberg described how light darkened some chemicals (photochemical effect) in 1694. The fiction book Giphantie, published in 1760, by French author Tiphaigne de la Roche, described what can be interpreted as photography. Many different discoveries were done before Louis Daguerre developed the daguerreotype in 1837. Daguerre took the first ever photo of a person in 1839 when, while taking a daguerreotype of a Paris street, a pedestrian stopped for a shoe shine, long enough to be captured by the long exposure (several minutes). Eventually, France agreed to pay Daguerre a pension for his formula, in exchange for his promise to announce his discovery to the world as the gift of France, which he did in 1839… Meanwhile, Hercules Florence had already created a very similar process in 1832, naming it Photographie, and William Fox Talbot had earlier discovered another means to fix a silver process image but had kept it secret. After reading about Daguerre’s invention, Talbot refined his process so that portraits were made readily available to the masses…
And finally… when captain is last who leaves the deck of drowning ship, photographer stays a little longer to make a last shot…
This photo was done not on Titanic… during this ‘canadian session’ nobody was hurt or injured, just my ‘digital negative’ was terribly scratched and damaged, so… I apologize for the quality.