Digital Camera Green
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 Canon PowerShot SX260 HS Digital Camera Green Bundle 8GB More 6196B001 $299.00 Time Remaining: 25d 10h 58m Buy It Now for only: $299.00 |
 Fujifilm FinePix XP30 142 MP Digital Camera Green New $91.00 (3 Bids) Time Remaining: 7h 1m |
 Kodak EASYSHARE C1530 140 MP Digital Camera Green $15.84 (6 Bids) Time Remaining: 12h 17m |
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 Fujifilm FinePix XP10 XP11 122 MP Digital Camera Green $33.00 (15 Bids) Time Remaining: 10h 47m |
 Sony Cyber shot DSC TX10 162 MP Digital Camera Green $145.00 (1 Bid) Time Remaining: 1d 17h 9m |
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 KODAK GREEN C142 10MP EASYSHARE DIGITAL CAMERA $38.99 Time Remaining: 6d 12h 56m Buy It Now for only: $38.99 |
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 Sony Cyber shot DSC TX10 162 MP Digital Camera Green $145.00 (1 Bid) Time Remaining: 3d 12h 9m |
 Canon PowerShot SD1200 IS 100 MP Digital Camera Green $64.95 Time Remaining: 25d 12h 29m Buy It Now for only: $64.95 |
 Olympus Stylus 1030SW 101 MP Digital Camera Green $14.05 (2 Bids) Time Remaining: 1d 10h 1m |
 Fujifilm FINEPIX XP30 14 MP Waterproof Digital Camera 5x Zoom Lens Green 4GB $125.00 Time Remaining: 22d 23h 40m Buy It Now for only: $125.00 |
 New in Box Fujifilm FinePix XP20 14MP Digital Camera Green $75.00 (1 Bid) Time Remaining: 1d 17h 34m |
 Fujifilm FinePix Z10fd 72 MP Digital Camera Wasabi green $10.49 (2 Bids) Time Remaining: 14h 42m |
 New in Box Fujifilm FinePix XP30 14 MP Waterproof Digital Camera Green $120.00 Time Remaining: 9d 10h 33m Buy It Now for only: $120.00 |
 Kodak Easyshare M5350 16MP 5x Optical Zoom Digital Camera Bundle Green $62.00 (9 Bids) Time Remaining: 4h 45m |
 New Fujifilm Finepix XP20 Digital Camera 14 Megapixels 5X Optical Zoom XP 20 $81.92 (3 Bids) Time Remaining: 19h 56m |
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 Pentax K x 129 MP Digital SLR Camera White Body Only $255.00 (8 Bids) Time Remaining: 2d 17h 55m |
 FUJI FINEPIX Z33WP 100 M PIX GREEN FAULTY SPARES REPAIRS PARTS DAMAGED $10.27 (3 Bids) Time Remaining: 1d 3h 41m |
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 Pentax Optio WG1 GPS YELLOW GREEN Digital Camera NEW $264.97 Time Remaining: 20h 12m |
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 Canon PowerShot SX260 HS Digital Camera GREEN + 2 Year Exended Warranty NEW $309.97 Time Remaining: 15h 4m |
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 Fujifilm FinePix XP30 142 MP Digital Camera Green $56.00 (2 Bids) Time Remaining: 1d 15h 7m Buy It Now for only: $119.99 |
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 HP PhotoSmart M547 62 MP Digital Camera Green $9.99 (1 Bid) Time Remaining: 12h 12m |
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 Fujifilm FinePix XP30 142 MP Digital Camera Green $28.00 (4 Bids) Time Remaining: 4d 6h 44m |
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 Canon PowerShot SX260 HS Digital Camera GREEN NEW $299.97 Time Remaining: 15h 5m |
 NEW UNDERWATER 142MP 27 LCD SCREEN FUJI FINEPIX XP30 DIGITAL CAMERA + GPS $58.20 Time Remaining: 3d 18h |
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 Polaroid i835 80 MP Digital Camera Lime green $25.00 (1 Bid) Time Remaining: 1d 10h 6m |
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 Nikon Coolpix S1100PJ S 1100PJ GREEN Digital Camera + 2 Year Warranty NEW $209.97 Time Remaining: 18h 3m |
 Pentax Optio WG1 GPS YELLO GREEN Digital Camera 8GB NEW $283.97 Time Remaining: 20h 11m |
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 Kodak EASYSHARE M532 140 MP Digital Camera Green $1.00 (1 Bid) Time Remaining: 4d 20h 53m |
 Sony Cybershot DSC TX10 Green Waterproof+8GB+Bundled 7Gift+1 Year Warranty $289.00 Time Remaining: 28d 7h 1m Buy It Now for only: $289.00 |
 Pentax Optio WG1 GPS YELLO GREEN Digital Camera 4GB NEW $280.97 Time Remaining: 20h 11m |
 Canon PowerShot ELPH 110 HS Digital Camera GREEN NEW $229.97 Time Remaining: 14h 39m |
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 Olympus Stylus Tough 3000 mju Tough 3000 120 MP Digital Camera $0.99 (1 Bid) Time Remaining: 4d 7h 16m |
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 Canon PowerShot SX260 HS Digital Camera GREEN + 32GB SD Card + Reader + Kit NEW $357.97 Time Remaining: 15h 5m |
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 Canon PowerShot SX260 HS Digital Camera GREEN + 8GB SD Card + Reader + Kit NEW $320.97 Time Remaining: 15h 5m |
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The Inside Picture Of A Digital Camera
Electronics greatest technological breakthrough in this modern age is the digitization of analog signals. Digital information, which is represented by 1s and 0s, is formed upon successful conversion of analog information, which is represented by a fluctuating wave. This conversion of analog to digital has made the world of science and technology make great advances into the field of computers, Internet, satellites, and space research.
On the consumer domain, the benefits of this technological breakthrough can be witnessed in consumer electronic products like TVs, computers, cameras, camcorders, CDs, DVDs, etc. Digitization gave rise to microchips, which could be programmed to perform any task. With the utilization of the microchip, the digital camera was born.
In a digital camera, the lens focuses the image, the shutter allows the entry of light reflecting from that image into the camera, for a fraction of a second, and the aperture determines the quantity of light allowed inside the camera. When the light enters the camera, it does not fall on a photographic film as it does in a conventional camera, rather it falls on an image sensor.
The image sensor is an electronic device, a semiconductor, made up of photosites that measures the light intensity. The photosite can only measure the intensity of light and cannot recognize any color. To overcome this, each photosite is covered with a color filter of red, or a green, or a blue color according to a pattern known as the Bayer pattern. Since the human eye is twice sensitive to the green color, the number of photosites having green color is twice the number of photosites having red or blue color. Millions of photosites are covered by this Bayer pattern. Each color occupies a single photosite, which is known as a pixel.
The more the number of pixels, the greater is the amount of detail that can be captured. The detail of the image is called as resolution, which is determined by the quality of the lens and the number of pixels in the image sensor. High-end digital cameras have about 12 million pixels, whereas professional digital cameras have about 20 million pixels.
The information of the pixels is recorded as electrical analog signals, is amplified, and then is fed into a converter, which converts the amplified analog signals into digital binary numbers, with respect to the color information of each pixel. These digital binary numbers are then fed into a computer chip residing inside the camera. The computer chip analyzes the digital binary numbers that have been made as per the color of individual pixels. This information is known as RAW data. For analysis, the computer chip subjects this RAW data using a technique known as demosaicing.
In this technique (demosaicing), the pixel color is determined as per the color of the neighboring pixels. For example, if a red color pixel is surrounded by blue and green pixels, then that red color pixel is treated as white color, since the color white is a combination of the colors, red, blue, and green. After demosaicing is complete, the image is further subjected to the photographer`s settings of the camera, like adjustments made for brightness, color saturation, contrast, etc.
High-end digital cameras usually do not do anything more to the image thus produced. However, professional digital cameras have a sharpening algorithm, which heighten the sharpness and clarity of the demosaiced and settings adjusted image. Professional digital cameras also have the option of saving the image in its RAW data before any demosaicing or adjustments are made by the computer chip. This is to give control to the professional photographers to make changes to the RAW data as per their own choices.
The image can be saved in an uncompressed format like TIFF or a compressed format like JPEG. Uncompressed formats preserve greater information; thus, the detail of the photograph is much more than a compressed format, where detail is less, as lesser information is stored. Hence, compressed formats are also known as lossy formats, since details are lost. An uncompressed format increases the file size, whereas a compressed format reduces the file size. Depending upon the need, the image can be saved either in an uncompressed or a compressed image format, as bits and bytes in a memory card. The stored image can be viewed on the digital camera`s display screen as a digital photo.
This digital photo can then be transferred from the digital camera to the computer`s hard disk via the serial port or USB port or FireWire port or Bluetooth wireless using Wi-Fi connectivity. RAW data and uncompressed data like TIFF take a longer time to transfer than compressed data like JPEG or GIF.
Once the data has been transferred to the computer`s hard disk, any photo editing software can manipulate and adjust it, as per the individual tastes and requirements of the photographer. The digital photo can then be printed on photographic paper, specially coated paper, or any other paper via a color inkjet or laser printer. Utilizing a plotter, it can be printed in larger sizes, in any other medium like canvas, acrylic, vinyl, etc. The digital photo can be saved on a hard disk, pen drive or a CD, for archival purposes.
With passing time, more and more features are being introduced in a digital camera. Nowadays, audio-video recording is also fused with the still image capturing capability of the digital camera, making them small camcorders (camera + recorders).
About the Author
This article can also be accessed in portuguese language from the News Article section of page www.polomercantil.com.br/camera-digital.php
Roberto Sedycias works as IT consultant for www.PoloMercantil.com.br
Sanyo VPC-CA9 Digital Dual Camera (Green)