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CCD (charge coupled device) and CMOS (complementary metal oxide semiconductor) devices have rows and columns of sensors called photosites Each photosite records a portion of the image When the shutter opens, each photosite collects and stores photons After the picture is taken, the photosite information is converted, row by row, from analog to
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Digital technology opens up all sorts of wonderful possibilities for the world of photography The latest and greatest technology, however, often creates more questions for the user than it answers The following list of commonly asked questions and answers will provide you with a basic overview of digital camera technology Later in the book, as we get into more detailed discussions of camera features and image editing you will be able to refer back to these questions if you need to Q: How does a digital camera work A: A digital camera has a lens and shutter, just like a film camera Both types of cameras use a metering device to determine the proper exposure needed to record the image A conventional camera records the image on film, which needs to be processed in a lab before you see the results The digital camera s image sensor acts as the film, recording the information in digital format, after which the image is transferred to the camera s storage device With the exception of the RAW format, the picture is processed in the camera, and you see the results almost immediately on the camera s LCD monitor If you shoot using your camera s RAW format, the LCD monitor displays an image of what the camera recorded Q: What is an image sensor A: The image sensor records images by converting light signals to electrical signals, which is then processed by your camera and stored in digital form Digital cameras use two kinds of image sensors: CCD (charge coupled device) or CMOS (complementary metal oxide semiconductor) CMOS sensors are thinner and can accommodate additional circuitry for features such as image stabilization and dust removal They also consume less battery power than CCDs High-tech cameras with CMOS sensors feature built-in noise reduction circuitry, which assures you of sharper pictures in most conditions Most digital SLR (single lens reflex) cameras use CMOS sensors, although there are a few notable exceptions that use CCD sensors
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digital and then transferred to the camera storage device
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Q: How do digital cameras store images A: Modern digital cameras use removable storage media, as shown in Figure 1-1 Think of camera storage devices as your digital film They serve the same function as the hard drive on your computer, but without as many moving parts Storage device capacity is measured in megabytes (MB) or, for ultra-high capacity cards, gigabytes (GB) the same units of measure used to measure computer hard drive capacity The number of images you can store on a memory card is determined by image resolution, which we will discuss later The following storage devices are commonly used by digital cameras:
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Figure 1-1: Memory cards come in a variety of capacities, shapes, and sizes
CompactFlash cards are used on older consumer point-and-shoot cameras, as well as on high-end digital cameras and professional digital SLR cameras They are sturdy and have storage capacities ranging from 8 MB to 16 GB Secure Digital (SD) cards are smaller than CompactFlash cards and yet are relatively sturdy They are used for information storage on many devices, including PDA (personal digital assistant) devices and digital cameras Secure Digital cards are available with capacities as high as 4 GB Owners of MMC (Multimedia Card) cards may be able to use the cards in their digital cameras, as they are the same physical size as SD cards Microdrives are miniature hard drives and will fit all cameras that accept CompactFlash II cards They are less expensive than CompactFlash cards of the same capacity and can store up to 8 GB of data Memory Stick is the storage media used by Sony digital cameras Sony s Memory Stick cards have capacities as high as 4 GB
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