Photographic Techniques, History of, development of photographic processes, starting with the recognition that certain chemicals changed tone as a result of exposure to light. Not until the 1820s, however, was the objective achieved of permanently fixing an image made by exposure to light. Since that time, scientists have continued to refine and improve the chemical and optical aspects of the photographic medium.
Microsoft® Encarta® Encyclopedia 2003. © 1993-2002 Microsoft Corporation. All rights reserved.
Microsoft® Encarta® Encyclopedia 2003. © 1993-2002 Microsoft Corporation. All rights reserved.
