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The term "white balance" originates from the world of video imaging where a device (waveform monitor) was used to match or "balance" the signals from the camera's red, green, and blue channels to make accurate whites under various lighting conditions, thus balancing your white. In this article, we'll use "white balance" for digital cameras in a similar sense: the process of measuring your light source's colour temperature accurately, based on your lighting conditions, and using that information to correctly balance your whites and colours.

Symptoms of poorly set white balance

If your camera's white balance is set incorrectly, or if your camera chose the wrong algorithm for measuring colour temperature, then you will observe a colour cast on your image: it will either look slightly blue, slightly orange, or slightly green. A low colour temperature shifts light toward the red; a high colour temperature shifts light toward the blue. Different light sources emit light at different colour temperatures, and thus the colour cast. Let's take a look.

What is colour temperature and how is it measured?

Colour temperature is effectively the warmth that is emitted from a light source, and the effect that temperature has on the intensity of any particular colour in the visible spectrum. For example, a 200 W bulb has more intensity in the orange/red end, and shows purples and blues with very little intensity. This makes your photo appear "warm". Daylight has equivalent intensity across the whole spectrum, so you see purples and blues with the same intensity as oranges and reds. But shade or a heavily overcast sky has more intensity in the blue/purple end, so your oranges and reds will have very little intensity. This makes your photo appear "cool".

Here are some examples of colour temperatures from common light sources:

1500 K: candle light

2800 K: 60 W bulb

3200 K: sunrise and sunset (will be affected by smog)

3400 K: tungsten lamp (ordinary household bulb)

4000-5000 K: cool white fluorescent bulbs

5200 K: bright midday sun

5600 K: electronic photo flash.

6500 K: heavily overcast sky

10000-15000 K: deep blue clear sky

Newer light sources, such as fluorescent and other artificial lighting, require further white balance adjustments since they can make your photos appear either green or magenta.

How does a digital camera auto-detect white balance?

Your camera searches for a reference point in your scene that represents white. It will then calculate all the other colours based on this white point and the known colour spectrum. The data measured from its R G B sensors is then run through a whole lot of numbers and predetermined equations to figure out which white balance setting is most likely to be correct. Remember, white balance is the automatic adjustment that makes sure the white colour humans observe will also appear white in the image.

Setting your camera's white balance to AWB will provide colour accuracy under many conditions. Your camera will adjust the white balance between 4000K - 7000K using a best guess algorithm. Auto white balance is a good choice for situations where the light changes over time and speed is an issue (e.g. animal photography, sports photography). However, you should avoid using auto white balance settings in the following situations:

1) Your scene is heavily dominated by one colour

2) Colour accuracy is absolutely imperative

3) You are photographing particularly warm or cool scenes (e.g. a sunset)

White Balance Presets

Most digital cameras come with multiple white balance preset options. These presets work well when:

1) The light source matches one of the preset white balance options

2) Your scene is heavily dominated by one colour

Let's review the most common preset options:

Tungsten - "Tungsten" is the name of the metal out of which the bulb's filament is made. The color temperature of this setting is fixed at 3,000K. Best Use: indoors at night. Otherwise, your exposure will turn out too blue. Creative Use: Set your exposure compensation to -1 or -2 and use this setting in daylight to simulate night.

Fluorescent - The color temperature of this setting is fixed at 4,200K. Best use: Fluorescent, mercury, HMI and metal halide lights used in your garage, sports stadiums and parking lots. Otherwise, your exposure will turn out too purple.

Daylight - The color temperature of this setting is fixed at 5,200K. Best use: studio strobe lights. Otherwise, your exposure may have a slight bluish tinge.

Cloudy - The color temperature of this setting is fixed at 6,000K. Best use: direct sunlight and overcast light. This setting will warm your photo by giving it an orange tinge, which is often desirable in landscapes and portraits. Creative Use: sunsets.

Shade - The color temperature of this setting ranges from 7,000K - 8,000K. Best use: shooting in shade, no direct sunlight (cloudy), backlit subjects. Otherwise, your exposure will turn out too orange. Creative Use: direct sunlight - it will warm up your photos even more!

Flash - The color temperature of this setting is fixed at 5,400K. This is almost identical to Cloudy but sometimes redder depending on the camera. Best use: overcast skies. Otherwise, your exposure will turn out too red.

For more photography articles, please visit Jennifer Clarkson's website at http://www.jclarksonphotography.com. To learn more about the books in her eSeries on Digital Photography, or to promote sales, please visit the following sites:

Choosing your camera and accessories
Getting the Most out of your Camera's Basic Settings

Canon Digital Camera

Canon Digital Cameras have been in the industry for quite a while now, and are consistently incorporating latest and advanced technology in their product range to keep up to the varying customer requirements. Canon offers a wide assortment of digital point and shoot, and digital SLR (Single Lens reflex) cameras to choose from.

15.1 megapixel EOS 500D is one of the latest addition in the EOS series of Canon Digital Cameras. APS-C sized CMOS sensor coupled with DIGIC 4 Imaging Processor delivers high resolution images. The camera comes with a Full HD (High Definition) Video capture at 1920x1080 resolution for up to 4GB per clip. continuous shooting speed of 3.4fps, EOS integrated cleaning system, and a precise 9-point AF system are some of the other major features associated with this Canon Digital Camera.

Canon Digital Cameras extend their EOS series with 12.8 megapixel EOS 5D. A full frame CMOS sensor with Canon’s professional EF lenses provide a good overall imaging experience. DIGIC II imaging processor enables speedy image processing with start-up time of a mere 0.2 sec to shutter speed of 1/8000 sec. The Canon Digital Camera further offers a continuous shooting speed of 3fps.

Canon Digital Cameras recently launched EOS 1000D, which is a 10.1 megapixel digital SLR camera. The 7-point wide area AF system offers up to 3fps continuous JPEG shooting with the available memory. The camera comes with a 2.5 inch LCD screen accompanied by a large viewfinder for effective subject framing even in very bright conditions. It is fully compatible with all canon EF and EF-S lenses and EX- series Speedlites. A compact and ultra light body further adds to the portability of this Canon Digital Camera.

The PowerShot A1000 of Canon Digital Camera series has been replaced by IS A1100. The maximum aperture size varies between f/2.7 to f/5.6 across the zoom range is based around a 2.3 inch LCD screen. 12.1 megapixel CCD image sensor coupled with DIGIC 4 image processor have the capability of delivering quality images. It offers a 4x optical zoom lens for quality captures in situations which requires constant zoom. A1100 features auto red-eye correction, which accurately detects and neutralizes the red-eye effect caused by flash.

The range of Canon Digital Cameras in India, has been widely acknowledged for good performance and high-end features. Updated and detailed information on Canon Digital Camera Prices, features and hot deals is available at www.consumermate.com

About the Author

John Wells is an expert in personal electronic gadgets including laptops, Olympus Digital Cameras price, LCD Tvs and Videocon Mobile, and many more. Read the Expert Reviews and Users Reviews of your gadgets at consumermate.com

Will a Canon Speedlite 430ex work for my Digital Rebel XT and G10?

If not, can you tell me which one will? I am buying used, and I figure Canon would be the best brand anyway, but I would like to get one that would fit both of my cameras...And possibly a new Canon in the future.

It is an excellent choice.

Pro photographer hints at Canon EOS 5D Mark III in 2011
Well-known pro photographer Vincent LaForet during a recent online workshop hinted that Canon is developing a third generation of the EOS 5D. He didn't say what it would involve but implied it would be ready sometime next year. Canon would also be touching on issues with the mini HDMI port on all of its DSLRs, LaForet added....

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