What is 'noise' refers to in photography?

Answer 1

Noise means image degradation caused by high ISO settings: grainy pictures. It's the same thing with high ISO film, except with film the grain can 'feel' gritty and artistic and with digital it's usually just distracting.
With digital images, you can reduce the noise with programs like Noise Ninja and Neat Image.

Answer 2

Check this out:

http://www.dpreview.com/reviews/canoneos400d/page17.asp

Scroll down to the part where you see sample images. Look at the gray and black bands above the Queen's image. At ISO 100, they pretty much all look smooth and uniform. As you go down the page and ISO is increased, you will start to see some blotches of color in the gray and black. This is noise.

Interestingly, this shows a comparison between the Nikon D80 and the Sony A100, which supposedly have the same sensor. Obviously, Nikon knows how to handle the information from the sensor better than Sony does, even though Sony makes the sensor.

Answer 3

Its caused by high ISO settings, normally its seen in dark areas. SOmetimes digital noise can be caused by saving it as a JPEG. JPEG's have what is called digital junk in the file, when the file is saved the file is compressed, to fill in the holes the image is filled with junk creating the small dots in your photos. For the most part they appear a pink color.

Answer 4

In Film photography, we call it grain
In Digital Photography, we call it noise
In Medical imaging, we call it artifacts

same stuff different terms.

Answer 5

littlle color spots in an image usuallyh found in dark photos or in the corners.. look at the other likns the user gave you

Answer 6

a

Answer 7

graininess of picture