Writing: Digital Cameras: A Product Comparison
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Digital cameras operate by letting light through a lens to expose a surface covered with electronic sensors that is held in the back of the camera. These sensors collect information when they are exposed to light, and cause an image to be captured as pixels, or small dots. This data is then stored electronically in some type of storage device, such as a memory card, and the sensors are cleared to capture the next image. The camera or storage device can then be connected to a computer, and the picture downloaded as an electronic file. As a file, the picture can be electronically altered using image manipulation software, pasted into an email, a document or a web page, or printed by a printer connected to the computer. Most home computers and printers are able to handle these digital files.
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The three cameras share the following features, according to product specifications provided by the manufacturers at www.kodak.com, www.powershot.com (Canon) and www.nikon-image.com:
- automatic controls for easy picture-taking
- manual controls, which allow the user to change some automatic settings if desired
- a built-in flash with red-eye reduction mode and fill-flash mode
- automatic white balance to compensate for color casts in different lighting conditions
- movie mode for short movies of 15 – 30 seconds
- CompactFlash Type 1 storage device
- rechargeable batteries are available