On Apr 30, 2:06 am, tacit <tac...@[EMAIL PROTECTED]
> wrote:
> In article
> <d5e4c9e0-c15e-4f6a-abbc-5791e090e...@[EMAIL PROTECTED]
>,
>
> "ronvi...@[EMAIL PROTECTED]
" <ronvi...@[EMAIL PROTECTED]
> wrote:
> > What is the difference between grain and noise? Do digital images have
> > both? Do both terms mean the same thing in the contexts of film and
> > digital?
>
> "Grain" refers to the maximum resolving power of film. It is a literal
> term; film is sensitive to light because it contains tiny grains of
> silver halide, which change when they are exposed to light. Smaller
> grains of silver halide mean higher image sharpness but also lower light
> sensitivity. The more sensitive a film is, all other things being equal,
> the more grainy the image is, because the larger the grains of silver
> halide are.
>
> Digital cameras do not have grain by definition; they do not use grains
> of silver halide. They do have noise--unwanted analog noise from the
> sensor.
>
> --
> Photography, kink, polyamory, shareware, and more: all
athttp://www.xeromag.com/franklin.html
I know that some of the high mega pixel point and shoot cameras have
little tiny sensors while the dSLR have, sometimes, fewer mega pixels
but relatively large sensors. I wonder if there is a distortion analog
between that and the size of the silver halide? Anyway thank you for
the explanation. Someone on a forum was describing a digital photo as
grainy and I didn't know what to think.
|
