Photography is the process of recording of latent image on the lightsenzibile layer and its following reproduction. Individual processes which were invented and improved during 19th and 20th centuries have been able to make the images visible in different chemical ways. The clue is to use the lightsenzibility of some compounds. These are mainly the salts of silver, iron and chromium. The most valueable are the salts of silver.

The luminography or painting with lightpen or illumination is so called photography of light sources like candles torches, flashlights mostly in movement. The light movement will remain in trajectories on media in camera mounted on tripod. Luminogram is called image of exposed lightsenzitive material only by light and without using of any other objects.

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