http://www.supportnow.biz/camera-working/
Digital cameras are basically the same as film cameras in their handling. They both have a lens to focus the specific image, a shutter to let light inside the camera, and an aperture to control the amount of light which enters the camera.
The differences between digital and traditional photography happen to be after the light enters the camera. A traditional camera captures the images on film, while a digital camera captures the image on an image sensor.
Image sensors are electronic devices made up of an array of electrodes (or photosites) which calculate light intensity. The most universally recognized type of image sensor for digital cameras is the CCD (Charge-Coupled Device) although others such as CMOS and Foveon are sometimes used.
The number of photosites in the image sensor gives the digital camera its megapixel (millions of pixels) rating. Each photosite corresponds to a pixel in the final image, so a camera which is rated at six megapixels, for example, has an image sensor which is 3008 pixels wide by 2000 pixels high.
When light hits the image sensor it is converted into electrical signals which are built-up and fed to an analog-to-digital (A/D) converter. The A/D converter changes the electrical signal into binary numbers which are processed by a computer housed in the camera body. Once the numbers have been harvested the resulting image is stored on a memory card.
Photosites can only measure intensity of light—not color. In order to produce a colour image, each photosite must be covered with a colored filter which can be red, blue, or green. These are the three primary colors which can be combined to produce any other colour including white.
The colored filters are arranged in a grid so that there are twice as many green filters as there are red or blue. This is because the human eye is twice as sensitive to green light. Filters are arranged in a pattern called the Bayer pattern – one row of red, green, red, green (etc.), and the next row of blue, green, blue, green (etc).
Since each photosite can only be covered with one coloured filter, computer processing is necessary to produce a full colored image. This is done by analyzing a certain pixel and its immediate neighbors and producing a composite colour from these calculations. For example, if a bright red pixel is surrounded by bright green and bright blue pixels, the bright red pixel must undeniably be white, because white is the combination of red, blue, and green. This process is called demosaicing.
After demosaicing the image is adjusted according to the settings on your camera. Most cameras have settings for brightness, contrast, and colour saturation. After these adjustments are made some cameras may also apply a sharpening algorithm to make the image clearer.
The final step before saving the image on the memory card is to compress it. Most cameras use JPEG as a compression format. This reduces the size of the file by eliminating excess data. This information cannot be recovered, so JPEG is called a ‘lossy’ format.
Several cameras have the ability to save uncompressed images as TIFF files or raw data. Raw data is the original photosite data even before demosaicing. It can be transferred to a computer for processing with special software that will perform all of the processing functions of the camera but with much greater control.
About the Author:
Drew Laughlin is a successful Webmaster and publisher of Learn-Digital-Cameras.com. He provides more information on Digital Photography, Digital Cameras, Digital Camera Accessories and how to purchase your digital camera for less on his website.Learn-Digital-Cameras.com.
Article Source: ArticlesBase.com – How Digital Cameras Work: Vital Information You Must Know Before You Buy
|
|
More Than a Thousand Cameras Are Working for Your Safety Poster Movie Spanish 11×17 More Than a Thousand Cameras Are Working for Your Safety reproduction Approx. Size: 11 x 17 Inches – 28cm x 44cm Spanish Style A mini poster print Pop Culture Graphics, Inc is Amazon’s largest source for movie and TV show memorabilia, posters and more: Offering tens of thousands of items to choose from. We also offer a full selection of framed posters.. Customer satisfaction is always guaranteed w… |
|
|
More Than a Thousand Cameras Are Working for Your Safety Poster Spanish 27×40 More Than a Thousand Cameras Are Working for Your Safety reproduction poster print Pop Culture Graphics, Inc is Amazon’s largest source for movie and TV show memorabilia, poster and more: Offering tens of thousands of items to choose from. We also offer a full selection of framed posters.. Customer satisfaction is always guaranteed when you buy from Pop Culture Graphics,Inc… |
|
|
More Than a Thousand Cameras Are Working for Your Safety Art Poster Print $24.99 Title: More Than a Thousand Cameras Are Working for Your Safety. Image Size: 11 in. x 17in. Paper Size: 11 in. x 17in. Art Poster PRINTWe have an unparalleled selection of both vintage and modern prints, posters, art prints, photographs and framed imagery. Our selections are ideal for both the office and home and we have over 400,000 images available for search or browsing. Your print is presente… |
|
|
Working In A Goldmine – Poster Sleeve … |
|
|
Working in a Goldmine(2 Mixes) Uk 12 … |
|
|
Hoover L2310 GUV 10 Amp 5-Gallon Garage Utility Vacuum $145.99 Keep your garage, vehicle, or workshop Hoover-clean with the Pro-Grade Garage Utility Vac (GUV). This convenient and organized central-vac system provides the power of a pro-grade vacuum in the comfort and convenience of your own garage, so you’ll never have to waste time at the car wash or with a dustpan again. The heavy-duty wall-mounted vacuum is easy to install, takes up no floor space, and is… |
|
|
Pelican StealthLite 2410 Recoil LED (35mm) $66.50 This Light is not submersible for scuba diving StealthLite 2410 Recoil LED Flashlight Same features as the StealthLite 2400 Flashlight but with the Recoil LED module that produces a true, bright collimated LED beam. The 2410 is corrosion proof, resistant to extreme temperatures, and submersible. (not for diving) It is powered by 4 AA alkaline cells (included). For hands-free operation, attach … |
|
|
Samsung CCTV SMMPIRCAM Color 2 Way Audio Camera Indoor Working Motion Detector $53.85 Samsung SMMPIRCAM CCTV Color 2-Way Audio Camera, Indoor (SMMPIR-CAM, SMMPIR CAM) For indoor use / For use with SAMSUNG CCTV systems exclusively / Transmits 2-way audio with color video. A-20040412-1027-110-L This item is BRAND NEW – not refurbished. It comes with all manufacturer supplied accessories, and full manufacturer’s USA warranty…. |
|
|
YourA10 $14.95 Beginners & Intermediate Acting Workshop Videos!Learn how to act, get an agent, professional head shots, auditioning techniques, developing the characters, and much, much more!Acting Classes, Drama, Commercials, Film, Television, DVDThis product is manufactured on demand using DVD-R recordable media. Amazon.com’s standard return policy will apply…. |
|
|
Dino-Lite AD413MTL Portable Digital Microscope / Camera w/ Aluminum Alloy Shell -Enhanced Working Distance $695.00 The AD413TL and AD413ML (medal bodied) are “Enhanced working distance” models with interchangeable nozzle features come with both a standard open faced nozzle as well as a sealed transparent cap nozzle designed to protect the lens and built in LED lights from dust, debris and moisture common to certain work environments. The removable nozzles also provide the user the option of increasing working … |
