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Digital Imaging Explained
by: The Daily Digital Dose
Digital Imaging Explained

By Warren Lynch www.wlynch.com

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.

Warren Lynch has been shooting commercial photography since the 70's. Clients include Several Regional and National accounts. Sign up for "The Digital Dose" and receive his Digital Photography tips every other week for FREE! http://www.photopheed.com.

 



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Floral Arranging as a Hobby


Flower arranging has become increasingly popular as a hobby, for people of all ages and backgrounds.

Have you ever put flowers in a vase and they just don't sit right? By learning a few basic principles you will be able to create attractive floral designs for your own home.

Flowers add the finishing touch. Imagine the pleasure you will get by being able to make a lovely flower arrangement for your entrance hall or a floral centrepiece for the dining room table.

Flower arrangements make the perfect gift for so many different occasions, such as birthdays, anniversaries, get well wishes, or to simply say "I care".

Unlike many other hobbies, you don't need a lot of expensive equipment. You can often use flowers and foliage from your own garden or you can buy some inexpensive flowers. Once you learn how to position flowers and foliage correctly, you can quickly make eye catching floral designs. You can also create floral designs using silk flowers. There are some very natural looking silk flowers available, and you will be able to make lasting floral designs. Imagine the thrill of being able to say "I made it myself".

The benefits of learning flower arranging are many -

Flower arranging is creative and fun

Relaxing. It's a great stress reducer

Interesting. Flower arranging is never boring

You will have a sense of achievement by learning a new skill

You will save money by making your own floral designs

Discover the exciting world of flower arranging. We teach you set-by-step how to make professional looking flower arrangements. It's easy when we have shown you how. Flower arranging is very interesting.There are so many different varieties of flowers available. In our flower arranging classes you will learn how to use them to their best advantage to create many different types of arrangements.

Home study flower arranging courses are available.

Copyright ©1996-Present Fay Chamoun, all worldwide rights reserved.

Floral Art School of Australia
and
International Floral Design School
22 Riddell Parade, Elsternwick, Victoria 3185 Australia.
Australia Phone: (03) 9523 5052 Fax: (03) 9523 6925
International Phone: +61 3 9523 5052 Fax: +61 3 9523 6925
e-mail info@floral-art-school.com.au

This information is brought to you by Floral Art School of Australia and International Floral Design School. For details of our home study floral design and flower arranging courses please visit http://www.floral-art-school.com.au



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