By Roxanne Joyce Malabanan| fotograpiya.com
In using digital camera, it is normal that you see a lot of brightly-colored dots, pixels and uneven colors scattered through your photo. These are called noises and are very common among digital pictures. It is hard to avoid these noises especially if you only have very little experience in photography. Problems like this often occur when using high-speed film cameras where you can use higher or faster shutter speed to avoid the blurring of the image. Noise is also called grain when it is on actual film.
Basically, noise is the effect of the digital sensor in trying to acquire a small amount of light. When the camera tries to clearly capture something too dark, it causes to lose electrical signals and that leaves spots to the picture which hurts the image quality. More noise is created as you set faster ISO on your digital camera as the electrical signals it picks becomes lesser.
Some cameras also create more noise than others. Pixels are made through converting light into electricity. Some cameras are also better at reducing noises than others. This is because different camera manufacturers also have different sensor chips that process the pixels in the images. The size and amount of pixels in those sensor chips affects the quality of the pictures.
Noise can also be gradually reduced in any camera by dropping its ISO level. Photography can be complex too, as it requires a great deal of consideration to its subject, the angle, lighting, and of course the camera that you will be using. Sudden changes in the setting may also create unwanted effects. Fortunately, modern cameras generally, are good at dealing with different noises. On the other hand, smartphones have not quite reached that point yet because they have smaller sensors which are more likely to be subjected to noise.
As of now, the industry is still working on possible ways of developing better sensors. In order to reduce noise, adding more light to the picture should help, as well as avoiding long exposure pictures. Prolonging the recording time of the sensor gives more chances of creating noise to the image. Overexposing the picture considerably to reduce its effective appearance may also help the quality using photo editing softwares. Underexposing the picture however, might have done otherwise.