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An article on Photography and related topics

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Digital Photography: all its many secrets

By: David Peters

It is important to realise that there is no such thing as a perfect camera, one that will be the best for everyone. Although we sometimes talk about 'cameras of the year' or 'top picks', such lists and awards are really of little consequence. The camera that wins most accolades may not be the one that is most suitable for you. The important thing you need to do is to think about what you want from a camera; you need to know what the various specifications mean, and to work out which is the best for you. Even those aspects that can easily be quantified - such as the number of pixels the sensor records - are not always straightforward. For some people a 2 megapixel (Mp) camera may be a better choice than a 4 Mp model. Even where image quality is important, you cannot assume that a 5 Mp camera will necessarily give better results than a 3 Mp model. As in life, other things are seldom equal.

During photography's entire history, the amateur and the professional have represented distinct and often contrary approaches to photography, each battling for supremacy. Has the digital revolution tilted the field of battle irrevocably in the amateur's favour? Or has it swept this traditional rivalry into the dustbin? Can anyone say? For the 19th-century practitioner, photography was fraught with personal and technical adversity. The darkroom environment was equally challenging: space was constrained, and in smaller field tents the photographer had to kneel or lie down to work. Ventilation was poor or non-existent, and lightproofing faulty. Digital photography is starting to become accessible to the average consumer. Camera prices are falling and image quality is improving. Compared to conventional 35-mm photography, there is no film or processing costs, and results are immediately viewable so a re-shoot can be made quickly if needed. Plus there are more and more applications where digital images are more convenient and cost effective.

White balance (WB) is the process of removing unrealistic color casts, so that objects which appear white in person are rendered white in your photo. Proper camera white balance has to take into account the "color temperature" of a light source, which refers to the relative warmth or coolness of white light. Our eyes are very good at judging what is white under different light sources, however digital cameras often have great difficulty with auto white balance (AWB). An incorrect WB can create unsightly blue, orange, or even green color casts, which are unrealistic and particularly damaging to portraits. Performing WB in traditional film photography requires attaching a different cast-removing filter for each lighting condition, whereas with digital this is no longer required. Understanding digital white balance can help you avoid color casts created by your camera's AWB, thereby improving your photos under a wider range of lighting conditions. A digital camera's auto white balance is often more effective when the photo contains at least one white or bright colorless element. Of course, do not try to change your composition to include a colorless object, but just be aware that its absence may cause problems with the auto white balance.

You may have already noticed that when you're outside on a sunny day using the Sports/Action mode to take pictures of your child playing soccer or your pet catching a Frisbee, that you get these great action images that are worthy of submission to Sports Illustrated Magazine. But when you go inside and take photos of a basketball game with the same camera in the same "sports mode", you get images that are only worthy of being erased before anyone else sees them. The main ingredient that's missing in the indoor photos is "light". The light inside a gym during a basketball game is minimal just as it is during a football game or soccer game after the sun goes down. Most of your sports/action photographs will be taken in available light. Flash isn't always allowed and there's also an effective range of your built-in flash (10 to 15 feet) that isn't conducive to taking action shots from the stands. Taking a photograph of a moving subject without a flash under low light conditions can result in blurry pictures. The problem lies in the way that exposure works; the lower the light, the slower the shutter speed that the camera needs to make a correct exposure. The slower the shudder speed, the more chance that the picture will be "blurry" because of camera movement or subject movement.

In computing, JPEG is a commonly used method of compression for photographic images. The name JPEG stands for Joint Photographic Experts Group, the name of the committee that created the standard. JPEG itself specifies how an image is compressed into a stream of bytes and decompressed back into an image and the file format used to contain that stream. The compression method is usually lossy compression, meaning that some visual quality is lost in the process, although there are variations on the standard baseline JPEG which are lossless. There is also an interlaced "progressive" format, in which data is compressed in multiple passes of progressively higher detail. This is ideal for large images that will be displayed whilst downloading over a slow connection, allowing a reasonable preview before all the data has been retrieved. However, progressive JPEGs are not as widely supported.

Redeye is a common occurrence in photographs. It occurs most often at night, because the pupils dilate to let in more light. When this happens, the flash of the camera reflects to the very back of the retina, creating redeye. Many cameras have settings to compensate, flashing a red light into the eye before taking the picture in order for the pupils to contract. However, if it is too dark, this setting won't make much of a difference. There are several ways to account for this, one of which is having the subject of the photograph look away from the lens. If there is still a problem, most photo editing programs have red-eye removal.

How do you begin to take good photos? The first thing to remember is this: It's the photographer that takes great photos, not the camera. Think about that for a minute. It's true isn't it? I've seen some people take great photos with a simple point-and-shoot camera, while some take lousy shots with the most expensive SLR. Always look for beautiful natural light. The best natural light usually occurs right before, after, and during sunrise and sunset. Be deliberate and creative. Think about what would make a good background, what would make for good colors. When you set out on a picture-taking spree, shoot 10 to 25 pictures so that you can be sure of getting a good shot. Vary the distance, setting, poses, or even the times of day.

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