5 Possible Reasons For Noise In a Photo

icon Dec 07, 2021

We buy good cameras and expect our photos to be high quality. But some imperfections still find their way to ruin the overall look of the pictures. No matter what you do, there are still weird-looking pixels, discoloration, and a grainy veil. Don’t worry! With our help, you can remove a noise of a photo and make it more attractive.

reasons for noise in a photo

What Is Noise In a Photo?

You probably know the feeling when you take a photo at night, and then you try to edit the exposure so that you can see something. But with the more light that you try to bring to your photo, the more noise there is.

So noise in photos are pixels that do not represent the color or exposure of the scene correctly.

So what are the reasons for noise in photos? Can you avoid them?

5 Reasons For Noise

  • Small Camera Sensor Size

The sensor is a region of a camera that is sensitive to light. Its size determines how much light the camera uses to create a picture. A bigger sensor gains more information, and the photos are better quality. When you use a camera with a small sensor, the pictures tend to be noisier and have less dynamic range. Pay attention to the size of the camera sensor, so you don’t have to denoise photos every time.

  • Pixel Density

The noise is a +/- variation. Considering this fact, imagine a sensor made of one big pixel and then the same sensor made of 4 smaller pixels. Every pixel has some shot noise and adds some read noise. The way these pixels combine cancels the shot noise and we are left only with read noise. Because upstream read noise is very low, small pixels tend to produce less read noise than large ones. Therefore, smaller pixels are more convenient than one large pixel.

  • Shutter Speed

The duration in which the shutter opens and exposes the sensor. It is another major factor whether you will have to denoise the photo.

We measure shutter speed in a fraction of a second. (Ex. 1/250) When you double the ISO, the camera only needs half as much light for the same exposure. So if the shutter speed is 1/250 and ISO 400, upping the ISO to 800 will produce the same exposure as 1/500.

Keep in mind. The amount of noise in a photo depends on how slow the shutter speed is.

  • Shadows

Shadow noise or luminescence is an effect that we can see in the shadows or darker areas of the photos. There is nothing you can do to reduce shadow noise while taking the picture, but you can use the AI tool on our website to denoise the darker areas of the photo.

  • Sensor Heat

The warmer the sensor, the more noise will be recorded. Why? Because the heat induces noise at lower ISO than usual. Sensors don’t like heat. If we want them to take good quality pictures we need to provide them with good conditions. Otherwise, we will have to spend hours denoising the photos.

That is why using our website you can denoise photos within seconds. Our AI denoiser uses Deep Learning to fix image noise of any kind. Even if it’s Gaussian noise, salt and pepper noise, shot noise, or quantization noise. Just a few clicks make everything perfect!


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