PDA

View Full Version : HF Nonlinear Noise of Analog Materials and Lenses, Processing them



Mustafa Umut Sarac
10-Sep-2014, 23:26
I read an mit research years ago do simulating one reference image noise in to other.

Is there a library plug in simulates the classical analog materials noise in to your image ?



Umut
Istanbul

vinny
11-Sep-2014, 01:24
I don't know how you cone up with these questions day after day. Way over my head.

Dan Fromm
11-Sep-2014, 07:02
Its called grain. http://www.photoshoptutorials.ws/photoshop-tutorials/photo-effects/natural-film-grain/

Plug-in? For which image processing package?

Arne Croell
11-Sep-2014, 09:43
This: http://www.dxo.com/intl/photography/dxo-filmpack/features is one software package simulating grain, but I am sure there are others.

Jac@stafford.net
11-Sep-2014, 10:04
Chose grain simulation with care. Some of the effects are just plain silly. Look into stochastic noise, resonance. I can only intuit (experiential heuristics) how the resonance works, but to me it gives smoother gradations of dynamic range. I mean all this in the purely visual sense because I am rather deaf. :)

(aside: my hearing aids have the option to turn on white noise which, for me, reduces perception of tinnitus. I feel that the same applied to a visual perception can, done right, do the same.)

jp
12-Sep-2014, 09:03
Digital noise, e.g. reference frames I think are like long exposure noise reduction. It subtracts character that is inherent to that sensor (like noisy pixels, etc..) sort of like noise cancelling for audio (make an opposite signal and mix them together properly phased). With film, you change sensors every shot, so that's not going to work. We avoid noise with film by not letting shadows get too thin on the negative, where the "signal" to noise ratio is reduced.

Jac@stafford.net
12-Sep-2014, 16:02
Digital noise is white. Grain is black, the random and irregular spaces between silver clusters. I am disturbed when I learn that a person does film but alway scans the film. Once scanned, an image enters the digital domain. It matters.