Photography \Pho*tog"ra*phy\, n. [Photo- + -graphy: cf. F.
   photographie.]
   1. The science which relates to the action of light on
      sensitive bodies in the production of pictures, the
      fixation of images, and the like. The production of
      pictures by the photochemical action of light on films of
      chemicals sensitive to light, and also the production of
      electronic images in electronic cameras, are both
      considered types of photography.
      [1913 Webster]

   2. The art or process of producing pictures by this action of
      light.
      [1913 Webster]

   Note: In traditional photography, the well-focused optical
         image is thrown on a surface of metal, glass, paper, or
         other suitable substance, coated with collodion or
         gelatin, and sensitized with the chlorides, bromides,
         or iodides of silver, or other salts sensitive to
         light. The exposed plate is then treated with reducing
         agents, as pyrogallic acid, ferrous sulphate, etc., to
         develop the latent image. The image is then fixed by
         washing off the excess of unchanged sensitive salt with
         sodium hyposulphite (thiosulphate) or other suitable
         reagents.
         [1913 Webster]

   color photography, the production of colored images by a
      photographic process. A variety of dyes are used to
      produced the colored images in photochemical processes.
      Such processes may or may not use silver to produce the
      colored image. Color photographs may also be produced by
      electronic cameras.
      [PJC]