Introduction to TechnologyChapter 12:
Photographic TechnologiesChapter SummariesSection 12.1
Photography is an important tool of communication technology. It is changing from a chemical to a digital technology. A camera has several main parts: the lens, shutter, aperture, and view finder. The lens focuses the light on the film and can magnify the size of the object. The shutter allows light to enter the camera. Section 12.2
Photographic film is coated with chemicals that are very sensitive to light. In a digital camera, tiny devices called “photosites” convert the light into an electrical charge. A movie camera uses the same components as a still camera. It photographs 24 pictures per second and creates an illusion of motion. Section 12.3
Chemical developer is used to reveal the latent image in exposed film, creating a negative—areas that appeared light in the original scene appear dark, and dark areas appear clear. Information from a digital camera can be fed directly into a computer. The information does not have to be changed because it is encoded as electrical charges.
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