19 August 2014 :: World Photography Day originates from the invention of the Daguerreotype, a photographic processes developed by Joseph Nicèphore Nièpce and Louis Daguerre. On January 9, 1839, The French Academy of Sciences announced the daguerreotype process. A few months later, on August 19, 1839, the French government announced the invention as a gift "Free to the World". With the help of Photography our knowledge about any thing & every thing of the Universe has increased leaps and bound. This is the day to pay tributes and remember the inventore and pioneers of photography and highlight their contributions. This years we are celebrating 175th anniversary celebration of World Photography day. In my opinion the major change which took place in the field of photography was the introduction of Colour photography.
Colour photography is photography that uses media capable of reproducing colors, which are traditionally produced chemically during the photographic processing phase. 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 colour photography, light-sensitive chemicals or electronic sensors 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. The recorded information is then used to reproduce the original colors by mixing various proportions of red, green and blue light (RGB color, used by video displays, digital projectors and some historical photographic processes), or by using dyes or pigments to remove various proportions of the red, green and blue which are present in white light (CMY color, used for prints on paper and transparencies on film).
Monochrome images which have been "colorized" by tinting selected areas by hand or mechanically or with the aid of a computer are "colored photographs," not "color photographs." Their colors are not dependent on the actual colors of the objects photographed and may be very inaccurate or completely imaginary.