What is noise in photography? Causes and ways to reduce/reduce noise in photography

You’ve heard a lot about the term noise in cameras but don’t know what it actually is. So what is noise in photography? Causes and how to reduce/reduce noise in photography? Let’s find out with Tnhelearning.edu.vn right here.

What is noise?

Noise is basically understood as the form of small particles distributed on the image, it is quite similar to the Grain on film . Noise can distort details in an image, resulting in low image quality. And this is certainly not a photographer wants it to happen to his photos.

Causes of noise in photography

The causes of noise are quite diverse. The factors that cause noise can be mentioned as: the camera’s sensor technology, ISO , exposure time is too long. In addition, the cause of Noise may also be due to the ambient temperature or because your camera has been used for a long time.

What types of noise are there?

There are two types of noise that you will encounter when shooting with a digital camera:

• Chroma noise: pixels that are distorted in color. It appears as blue, red dotted particles
• Luminance noise (monochromatic noise): quite similar to noise on film cameras (grain), is noise caused by black, white and gray noise (no color) like salt and pepper dots.

How does ISO affect image noise?

If the ISO is adjusted to low, the film or sensor is not sensitive to light, and the photographer needs to open the lens aperture to get more light for the sensor, or adjust the shutter speed to provide more light. over a longer period of time.

Conversely, if you use a high ISO, you can take pictures with less light in a short time. However, when adjusting the ISO index too high, your image will appear Noise (noise). The higher the ISO, the more likely the noise will appear.

How to reduce and eliminate Noise (noise) in photography

An image with too much noise will make the image poor quality. If you find that your image has too much noise, then follow the steps below to save your image.

Noise reduction (noise) when taking pictures

Adjust low ISO: High ISO will increase the possibility of image noise. To minimize image noise, you should adjust the ISO below 16000 to get the right exposure. However, this level of noise depends on how much ISO the camera’s sensor is capable of shooting.

Larger sensor: The size of the sensor plays an important role in image quality including image noise. The sensor is capable of capturing light and converting what you see in the viewfinder and LCD screen into an image. Therefore, to reduce image noise, you should choose for yourself the larger the image sensor, the higher the image quality will be obtained.

Proper exposure : A properly exposed photo reduces the possibility of image noise. However, depending on the model, the exposure method is different. Some cameras allow light sensitivity to be set automatically even in M mode.

Noise removal in post-production

In addition to reducing Noise when taking photos, you can also remove Noise in post-production. This way you can adjust the noise level as well as eliminate it if you want with Lightroom software . To reduce / eliminate Noise in Lightroom you need to adjust the Luminance bar to the right to get a satisfactory image.