Digital Imaging Explained
Digital Imaging is a process where an electronic photograph, scanned document, or image is converted into a series of electronic dots called pixels. Pixels is an acronym for "picture elements".
After the image is converted, or digitized, it is stored on a memory storage device which may be a hard drive or some sort of electronic storage device such as a memory stick. The pixels are stored in a compressed format to save storage space.
As each pixel is being created it is assigned a color value, called a tonal value, of black, white, shades of grey, or an actual color. These pixels must be processed by a piece of software in order for them to be called up and viewed as an actual image later.
Traditional cameras capture images onto film while digital cameras use an electronic chip known as a Charged Coupling Device (CCD). The CCD is actually a grid of miniature light-sensitive diodes. These diodes convert photons (light) that strikes them into electrons (electrical impulses). The technical name for these diodes is 'photosite'. The brighter the light is that hits the photosite the stronger the electrical charge is that's produced.
After converting the photons into electrons, a mini-computer, located inside of the camera, reads the stored electrical value in each photograph. Then a built-in analog-to-digital converter turns the stored electrical value into a digital value. These digital values are then stored on the cameras memory storage device. When these digital values are recalled by software, and displayed on a screen, they reproduce the image that was originally captured by the camera or digital input device.
The digital image that is created by the CCD is huge. It's far too big to be easily stored in the relatively little amount of storage space that's available to a digital camera. Accordingly, the camera's computer compresses the image to make it smaller.
There are two basic methods for achieving this compression. The first method takes advantage of repetitive patterns in the image. For example, if you are taking a picture of an airplane that is flying in the sky, a lot of the picture will be a chunk of blue sky. The camera recognizes that there are multiple parts of the image containing the same digital information, so it only records a small piece of the sky. Then it simply creates a map to tell it where the rest of the sky belongs. When the picture is ultimately displayed the sky appears exactly the same as it did in the original image when it was first captured. The only difference is that the overall storage requirements were reduced thanks to the camera's clever mapping techniques.
The other method uses a procedure called irrelevancy. This methodology automatically removes digital information that is not visible to the human eye such an infra red light.
Digital imaging is amazing yet we have only started witnessing the revolutionary changes that are yet to come.
About The Author
Warren Lynch has been shooting commercial photography since 1979. Clients include Several Regional and National accounts. Sign up for"The Digital Dose" and receive his tips every other week for FREE! photopheed.com.
A Guide to Underwater Camera Cases
If you are buying a new underwater camera or video camera, you will need an underwater camera case. And this case needs to be watertight, airtight, dustproof, crush resistant and designed to keep your valuable equipment safe from all the elements.
Top 10 Digital Cameras - What You Need To Know About Them
There are a large number of top 10 digital camera lists available on the Internet today. Each one of them is different and they all have different sets of criteria, on the basis of which these lists are compiled.
Elephants in the Sky and Four Poems
Elephants in the Sky[1980s, Lee Evens in Mali, Timbuktu/Africa]Advance: Lee was discharged from the Army in 1980, whereupon, he traveled the world, one of those locations was in Mali, by the legendary city of Timbuktu; whereupon he found himself in the middle of a plague, a plague of locust.[Diary-review]There were swarms of locust over the top of my car, in front of me, swarms, a dark shadow covering the sky, descending, descending onto the road-in front of me, behind me, it was locusts, locusts, locusts-locusts everywhere: so thick, thick as layers that my car was slipping and sliding as if on ice.
Buying Your Child A Digital Camera - What You Need To Know
Purchasing any gift item for your child is a mind-numbing task. You can never be sure whether they will like what you buy for them or not.
Where Do Great Ideas Come From?
At a Photo Club meeting I attended recently, the President made a comment on another meeting he had attended, where someone in the audience asked the presenter where to find good subjects to photograph. The presenter in question started giving specifics instead of identifying the core issues in question, Attitude and Perspective.
How a Digital Camera Works
The digital camera is not something of a magic box that came out of the blue and made wonders! The digital camera is very much like the conventional analog camera, but the technology has been altered. It also contains most of the associated components that the conventional camera contains, like lens and a shutter for letting in light, however instead of reaching a photosensitive film, the light is made to fall upon array of image sensors or photosensitive cells.
Applications of Underwater Video Cameras
There's so much you can do with an underwater video camera. If you enjoy snorkeling or diving, you can use the camera to show your friends and family the beautiful tropical fish, colorful coral reefs, and other underwater treasures you encountered on your vacation.
Better Photos with Your Digital Camera
Everyone has a digital camera today and we all take a lot of photos. But if your photos still have trees coming out of your father's head, mom has red eye, and your beloved pet is never facing the camera then here are some tips to help you take better photos.
Digital Camera Memory Cards
A digital camera accessory you should purchase is a spare memory card. Most cameras are sold with a 'starter' memory card that is usually a low capacity card that's enough to take a few sample photos on, but not enough for day-to-day use.
Photography Contest - a fun and rewarding experience
Do you like to take photos? Are you always standing by with your camera waiting for that moment that is meant to be captured on camera? You may even be taking photography classes or maybe you have already completed a photography course and you want to share your photos with others. You may want to get into photography as a career and winning a photography contest will help you get recognized.
Terms Used The In The Stock Photography Business
So you are a small business person or web designer and you want to purchase some stock photography for your website. Great.
How Can I Preserve My Lifetime of Memories in Photographs?
Like most folks you have probably have organized and sorted your photos atleast once. The problem is they never seem to stay organized no matter how hard you try, and even if they do they seem to lack that original impact that they had shortly after you took them or if they do, you never drag them out until sadly, someone passes on.
Last month we bought the Canon Powershot A80 online for about $325 including shipping after looking at digital cameras for about a month. It had all the features we were looking for in our price range and the stylish gleaming metal case didn't hurt either.
Digital Camera Reviews and Ratings De-Mystify the Choices
Shopping for a new digital camera can be quite frustrating with the hundreds of choices available. Digital camera reviews clarify this confusion by comparing camera features and options, then rating how each camera compares with similar models.
Fuji Digital Cameras
Fuji digital cameras entered the market in the late 90's. Started in Japan in 1934, Fuji has always tried to stay ahead of the pack.
How To Avoid Or Reduce Red-Eye
Photography with the aid of a digital camera is beyond doubt very fascinating. However, it also has many a nooks that the users of the digital camera must be aware of and also must be well educated to deal with in order to produce good photographs worth the most prized digital camera.
The Benefits of Underwater Digital Cameras
Underwater digital cameras are fun and easy to use under the water and great above the water as well. Use your underwater digital camera in all kinds of weather, for many activities and in a variety of locations that could be either wet or wild.
Online Photo Sharing: Not Just for Family and Vacation Photos
You may have joined the photo-sharing craze to share your family vacation photos, but have you thought about other uses for photo sharing?Here are just a few ideas:Scrapbooking: Show off your creative projects. You can design scrapbook pages and enhance them with clipart using software like Paint Shop Photo Album or FotoFinish and then upload them to a photo sharing site for everyone to enjoy.
Seven Ways for Saving Your Digital Images Forever!
So, you have taken lots of pictures with your new digital camera, the memory card is full, and you are wondering how to store and archive your images.1 Buy another memory cardThe method of storing your images with least effort is to buy a new memory card and keep your images on the first card.
Wedding Photography: How to Become a Successful Wedding Photographer
Once in while I receive e-mails or phone calls from aspiring or beginner wedding photographers asking me for advise on how to become successful in the wedding field. My first question is always what their motivation is to become a wedding photographer.
|home | site map|