Ghost-Hunting For Dummies by Zak Bagans

Author:Zak Bagans
Language: eng
Format: epub
ISBN: 9781119584803
Publisher: Wiley
Published: 2019-11-12T00:00:00+00:00

Advancing to digital cameras

Today, most film cameras have been replaced by digital cameras, which save money on film and developing and offer instant results when a shot is taken. The origins of digital cameras can be linked back to the computer imaging that was being done by NASA back in the 1960s. During this time, NASA was preparing for the Apollo Lunar Exploration missions and in advance of men landing on the moon, they sent out a series of probes to map the surface. The probes relied on video cameras that were outfitted with transmitters that could broadcast analog signals back to mission control. The weak transmissions were often plagued by natural interference and television at that time could not transform them into images that were coherent.

NASA researchers soon began searching for ways to enhance the signals by processing them through computers. The signals were analyzed by the computer and then converted into digital information. The interference was removed, and the critical data could be enhanced to produce clear images of the moon. This was the first real digital imaging to be done but it would soon revolutionize photography as we know it. Digital technology was not only used by NASA to explore the solar system, but it also made possible a number of medical imaging devices, changed the world of entertainment, and made photography and video accessible to people who had never used it before.

The digital cameras of today capture images electronically and convert them into digital data that can be stored on a chip inside of the camera. The images can then be transferred and manipulated using a computer. Like conventional cameras, digital devices have a lens, a shutter, and an aperture but they do not use film. When light passes through the lens, it is directed to a light-sensitive chip called a charged coupling device (CCD). The CCD converts the light into electrical impulses, feeds it into the processing chip, and then transforms that into digital information. Digital images offer many things that a standard camera cannot, freeing the photographer from film and optics and allowing the images captured to be transformed in ways that have never been available before.

All images that are seen by the human eye are formed from the energy given off by light. For the digital camera to store an optical image, it must be converted into digital information. A simple photograph is composed of a wide range of color and light variations and, like the spectrum of natural light that it represents, the tones of the photo are continuous and unbroken. However, a digital image consists of scores of points of light that have been sampled from the light spectrum. The range of tone is determined by the camera’s capacity to store and sample different light values. The more expensive the camera, or at least the greater number of megapixels of light that it offers, the better image the photographer will obtain. When a photo is taken, the pixels in the image

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