noise VS grain

[digimage]

<p>untill now I'm not understand much about NOISE & GRAIN . TECHNICALY THEY ARE THE SAME OR NOT HOW TO PREVENT & IMPROVE THAT MATTER IN LOW LIGHT . thank you for concern & share out all information .</p>

[model mayhem gallery]

<p>Hello Jordan<br>

Noise and Grain are not the same. I think of grain as something inherrent in the film. I.E. Black Walnut and Mahogany have a specific type of grain. Faster films have a more pronounced Grain. Noise from a digital camera is more like when your TV channel goes off the air at night and there is just the white noise on the screen. Noise is more random and in my opinion less appealing than Film Grain. To reduce in both situation use lfaster lenses F2.8 or faster which will allow you to use lower ISO settings there fore reducing Noise\ Grain.</p>

[albert_richardson1]

<p>Grain refers to the actual size of the granules of silver halide used in the emulsion layer of film. Generally, fast films use a larger grit than slower ones. This is to increase the film's sensitivity to light by giving the light less to do to make the exposure. The result in low light is often a clumpy look in the photo that is easily recognised. This picture looks a little like it was made on the surface of some fine grit sandpaper.</p>

<p>Noise is a digital phenomenon. Each light sensitive spot on a sensor is called a pixel. Pixels are laid out in a two dimensional grid covering the whole of the sensor's surface. Each pixel is independent of the others in the grid. Like other electronic devices, the pixel has an operating range built into it whereby it converts the light it detects into an electronic signal. Light intensities close the ends of this range, or the upper and lower thresholds, often produce unpredictable output signals because the pixel detects something, but cannot measure it accurately. Noise is the term for inconsistent results and spots resulting from a pixel firing when it shouldn't. </p>

[digimage]

<p>thank you very much to your answer , very helpful very technical & very complicated , please hopefuly I can have more answer if you can , thanks</p>

[jeff_livacich]

<p>Grain is inherent in film. The image is formed from it. Noise is a byproduct and not necessary to form the image. It could be said that grain is a characteristic of the image and noise is a defect or imperfection of the image.<br>

Grain can be kept small in low light by using lower ISO film and exposing it for a longer period.<br>

Noise is not so simple. Noise increases with both sensitivity and time of exposure, because it "builds up" over time. In some cases noise will be less with low sensitivity and longer exposure, and sometimes with higher sensitivity and less exposure. It varies with different camera models and is easy to figure out with test exposures to see how your camera performs.<br>

A faster lens used wide open allows lower ISO's or faster shutter speeds, which will allow less grain or noise.</p>