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The digital image that is created by CCD is huge. It's far too big to be easily stored in relatively little amount of storage space that's available to a digital camera. Accordingly, camera's computer compresses image to make it smaller.
There are two basic methods for achieving this compression. The first method takes advantage of repetitive patterns in image. For example, if you are taking a picture of an airplane that is flying in sky, a lot of picture will be a chunk of blue sky. The camera recognizes that there are multiple parts of image containing same digital information, so it only records a small piece of sky. Then it simply creates a map to tell it where rest of sky belongs. When picture is ultimately displayed sky appears exactly same as it did in original image when it was first captured. The only difference is that overall storage requirements were reduced thanks to camera's clever mapping techniques.
The other method uses a procedure called irrelevancy. This methodology automatically removes digital information that is not visible to human eye such an infra red light.
Digital imaging is amazing yet we have only started witnessing revolutionary changes that are yet to come.
Warren Lynch has been shooting commercial photography since the 70's. Visit his website at www.wlynch.com or just him a call at 1-502-587-7722 to quote on your next project. Get his Bi-weekly Digital Photography Tips for FREE!. Subscribe to "The Daily Digital Dose" Now. www.photopheed.com