direct positive
a photographic transparent positive made by exposing copy in direct contact with film, eliminating the necessity of making a negative first.
Direct positive print
Made from a transparency without an internegative on a direct positive colour paper. A high contrast positive image slide made only from camera ready originals with no negative required.
Direct Positive Black- and- White Transparencies
In a typical solarization of film, the lighter regions of the original scene are produced as a negative and the darker regions are produced as a positive, ...
The direct positive process involved exposing silver chloride paper to light, which turned the paper completely black. It was then soaked in potassium iodide before being exposed in a camera.
DIRECT POSITIVE-A positive image obtained directly from another positive image without the use of a negative.
-Ferrotype process - method of creating direct positive images with dark enameled metal plates as a base. Also known as the tin-type process.
It is also called a slide film, and is exposed directly in the camera and processing through a direct positive process to give positive color images that are directly viewable on a slide projector.
1855-57: Direct positive images on glass (ambrotypes) and metal (tintypes or ferrotypes) popular in the US.
Dust marks on direct positive materials are black rather than white and are pretty well impossible to remove. The only cure is prevention, making sure that the transparency is absolutely perfectly clean at printing time. Good luck! ...
 See also: Photograph, Negative, Image, Light, Positive
  
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