Camera Filter Set

Camera Filter Set

How Digital Cameras Work: Vital Information You Must Know Before You Buy

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

To learn more about Digital Photography, Digital Cameras, Digital Camera Accessories and how to purchase your digital camera for less then visit Learn-Digital-Cameras.com.

Most practical, useful, and essential accessory for a DSLR camera besides an external flash?

I've been allowed to get just one accessory for my Canon EOS 20D camera.

I've been thinking about a wide-angle lens, or maybe an extension cord for my external flash, or maybe a set of reflectors, or a set of filters.

Please tell me what you think is the most useful one. My aim is to take amazing photos, and that's it, and I don't know which one accessory can help me most.

Thanks!

What kind of pictures you want to take actually will dictate this to you. The one thing that I think is an imperative is a polarizing filter. (has to be circular not linear on dslr to work correctly.) If you do not have one that is the one thing I would add.
This one filter alone is worth far more than a whole set of filters in my book.

A wide angle lens is nice, and sometimes is combined with a macro lens which if you plan on taking pictures of tiny things like insects would be beneficial.
You might find this site of interest http://www.silvaspoon.net
A tripod or mono pod is another essential to consider.

Time Lapse Photography - Ice Cube Melting - HD 1080p