A Photogram is a photographic image that is very similar to an X-Ray.
A photogram is made by the placement of objects directly on the surface of a photo-sensitive material like photographic paper which is then exposed to light. The photogram is totally based on the laws of photo sensitivity.
The areas of the paper that receive light when exposed, appears dark and the part that do no not receive any light appears lighted. The net result of photogram is thus a silhouetted image with a fine texture of alternate light and darkness. Though photogram comes under the category of photography, photogram does not require a camera to build up an image.
In the history of photographs, photogram holds a position of prestige since they were the first genre of photographs. William Fox Talbot is regarded as the father of photogram who made many of these images by the placement of leaves and pieces of objects like lace on photo-sensitive paper and later exposing them to the sun. One more person who deserves the credit for the evolution of photograms is Anna Atkins. She brought out a book of photograms. This is the first recorded book of photographs in the history of photography.
The main component of photogram is the light. The natural source of light, the sun produces the negative images by its exposure in correct proportion on the light-sensitive paper.
