Digital Photography Takes Off
Two Different Directions
The charge-coupled device (CCD) sensor—the core technology of the digital camera—exists in two formats: the linear array and the area array. The linear array provides one, hearty technology. The area array offers a number of options, depending upon its configuration within the camera. Agfa, with a U.S. base in Ridgefield Park, NJ, offers the ActionCam and StudioCam digital cameras, and has published a reference guide entitled A Guide to Digital Photography Theory and Basics, which provides the following list of sensor options to consider when shopping for the digital camera best suited for your catalog’s workflow.
Linear Array Sensor
• Trilinear array: Consists of three rows of CCD elements, coated with RGB filters, this technology configuration works by scanning lines of information across the image. Since the three filters work simultaneously, only one pass is needed to collect the image data.
Environmental tolerance: Vibration free with constant lighting. Variations in the lighting will translate as a band across the image.
Applications: This technology is considered mature, as far as scanning is concerned. The trilinear CCD sensor will capture high resolutions, but not instantaneously.
Area Array Sensors
Also called matrix arrays, this technology option is designed to capture the entire image in one to three shots, but often at the cost of resolution. Interpolation through color management software provides compensation.
• One-shot, triple matrix: Three separate matrix arrays work simultaneously to capture RGB information, therefore avoiding the resolution difficulty inherent in single matrix set ups.
Applications: Fast enough to capture moving subjects.
• One shot, single matrix: CCD elements are coated with RGB filters and capture full RGB information instantaneously.
Disadvantage: Resolution is diminished requiring software interpolation. Color fringes may result around high-contrast edge details.
• Three-shot, single matrix: An uncoated CCD matrix captures a full color image after three separate readings through RGB filters affixed to a rotating wheel.