Photographic processing
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Photographic processing or photographic development is the chemical means by which photographic film or paper is treated after photographic exposure to produce a negative or positive image. Photographic processing transforms the latent image into a visible image, makes this permanent and renders it insensitive to light.
Black and white negative processing is the chemical means by which photographic film and paper is treated after photographic exposure to produce a negative or positive image. Photographic processing transforms the latent image into a visible image, makes this permanent and renders it insensitive to light.
A cut-away illustration of a typical light-trap tank used in small scale developing
Enlarger
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An enlarger is a specialized transparency projector used to produce photographic prints from film or glass negatives, or from transparencies.
Staff at William Henry Fox Talbot's commercial calotype establishment in Reading, Berkshire. Salted paper print from a calotype paper negative, the left component of a panoramic pair of views, 1846.
Photographic enlarger.
Durst color enlarger
Enlarger lens: using the aperture ring, the photographer adjusts the iris diaphragm.