Xenon - a rare gas sometimes used with electronic flash tubes and enclosed arc light sources.
Xerography - a photographic process which uses an electrically charged metal plate. On exposure to light the electrical charge is destroyed, leaving a latent image in which shadows are represented by charged areas. A powdered pigment dusted over the plate is attracted to the charged areas, producing a visible image.
Xography - a system of photography which produces prints and transparencies with a three-dimensional effect. A cylindrically embossed lenticular screen is placed in contact with the film and a shutter behind the lens is arranged to scan the subject during exposure.
X ray - electromagnetic radiations beyond ultraviolet which, when passed through a solid object and allowed to act upon a sensitive emulsion, form a shadow image of the internal structure of the object.
X ray film - spectral sheet film for radiography, having a thick emulsion coated on both sides of the support to increase the absorption of X rays.