Thursday, November 10, 2016
Creative Spot by Zita Perera Subasinghe
Photography, the Story
The oldest surviving photograph
Photography is the process of using light or other electromagnetic radiation to capture an image of a subject in front of the observer and recording it in a device using lenses and any other focussing method so that the record of the image is cast on a surface impregnated or painted with a light sensitive substance and where the image which can be fixed and duplicated for the purpose of preserving it for the future and also for spreading the message to others for information and entertainment.
Photography: The word photo came from Greek phos to mean light and graphy the art of ‘drawing’ with light. It is both a science and an art.
History: Long before modern photography, Chinese philosopher Mo Ti (also written Mozi) in and Greek mathematicians Aristotle and Euclid described a pinhole camera in the 5th Century BC . But it was not until 6th Century AD that the Byzantine mathematician Anthemius of Tralles used a type of camera obscura in his experiments using the observation that some substances are visibly altered by exposure to light. Initially nobody thought of bringing these two phenomena together until around 1800, when Thomas Wedgwood made the first reliably documented although unsuccessful attempt. In the mid-1820s, Nicéphore Niépce succeeded, but several days of exposure in the camera were required and earliest results were very crude.
Niépce's associate Louis Daguerre went on to develop the daguerreotype process, the first publicly announced photographic process, which required only minutes of exposure in the camera and produced clear, finely detailed results. It was commercially introduced in 1839, date generally accepted as the birth year of practical photography.
Metal-based daguerreotype process soon had some competition from the paper-based collotypenegative and salt print processes invented by William Henry Fox Talbot.
Subsequent innovations reduced the required camera exposure time from minutes to seconds and eventually to a small fraction of a second.
Introduction of new photographic media which were more economical, sensitive or convenient, including roll films was the next advance. This enabled its casual use by amateurs. It was now made possible to take pictures in natural colour as well as in black and white.
The commercial introduction of computer-based electronic digital cameras in the 1990s soon revolutionized photography. As a result traditional film-based photochemical methods were increasingly marginalized and image quality of moderately priced digital cameras was continually improved.
You’ll find below two good examples of how old photos of get-togethers of Batch’62 bring back memories. Talking about it alone wouldn’t be the same!
Sent by Zita PereraSubasinghe
with technical help from Mahendra Gonsalkorale.
(2)The BBC radio, Wikipedia, and other Internet sites