Digital cameras come in so many shapes and sizes that they can be literally called custom made for the consumer. One of those variations is the digital zoom camera. It is important to know about a few aspects of it to totally understand the working of this type of camera better.
Very often we take photographs and then try to adjust the focus of the picture. We either try to concentrate on a certain area or enlarge other areas. This can be done in two ways, either by using our hands and physically moving closer to the object, or by using the camera features and changing the dimensions of the object electronically. This gives rise to the two categories of zoom in the digital zoom cameras.
This is always a better option in the digital camera as compared to digital zoom. This allows us to move the lens of the camera closer to the object and hence works by changing the focal length of the camera mechanically. The result is that the picture quality is not distorted and can be printed in many different sizes. This quality is similar to those offered in the normal film cameras but should be insisted upon while purchasing the digital zoom camera as well.
This method of changing the attributes of a picture is utilized by defining the portion of interest in the picture and making changes on it using the software in the camera itself. It is done automatically by the camera and the chosen area is defined and enlarged to fit the frame. This method is known as extrapolation. However, extrapolation comes at the cost of interpolation and is said to harm the picture quality. Digital zoom cameras that are equipped with this feature are usable by customers who are amateurs and not too keen on changing the dimensions of pictures. Since the changes in dimensions are often done by compromising on the other portions of the picture, the quality is reduced.
The Better Choice
It is pretty obvious that the better choice would be to go in for an optical zoom as opposed to a digital zoom since the image quality is not lost. However, sometimes the digital zoom produces better pictures than manual cropping. In these cases it can preserve the image quality and detail by performing interpolation before compression. It is advisable to check the type of zoom for the camera you’re considering. Often digital zoom is marketed off to the laymen as beneficial, thus knowledge in this field would be greatly helpful for someone intending to buy a digital zoom camera.