[Leica] Film/Digital

[Frank.Dernie at btinternet.com (Frank Dernie)]

It takes 4 pixels for a full colour image, but it obviously takes 3  
clumps of silver dye produced from the development of the silver  
grains to produce a colour image in film too. The pixel pitch  
includes the space between the actual photosites but this is rendered  
irrelevant by the microlenses anyway.
AFAIK the statement that film is binary is true though I am not and  
expert, it won't be a question of opinion but a matter of simple  
science. He points out the irony of the difference between binary  
chemistry and analogue pre-sampled digital succinctly.
This is an old analysis which is well established.
Frank


On 27 Mar, 2007, at 21:54, Frank Filippone wrote:

> Interesting arguments....  I am not sure I agree with him in the  
> basis that film chemistry is a binary relationship... either black
> or white, whereby the clumping them gives one shades of grey by the  
> proportion of black to white in the clump.  But I do see the
> rationale in his arguments.  I guess I see film as an analog  
> product with the individual clumps being shades of grey.  The clump
> size is the first issue... how big is a film clump?   I have never  
> seen this printed, but I bet the guys at Kodak know off the top
> of their hats.....
>
>  What I do find is the fallacy that digital sensor elements are 6  
> microns in size..... he does not mention that it takes 3 ( 4?)
> elements to represent a pixel location, and there is space between  
> the sensor elements... giving the area of a pixel to something
> like 6u* 3 pixels + something for space.....  bigger than he claims  
> for film.....
>
> Interesting analysis......
>
> Me too on the film testing stuff..... hate it.
>
> Frank Filippone
> red735i@earthlink.net
>
>
> http://www.luminous-landscape.com/essays/clumps.shtml
>
> Didier
>
>
>
>
>
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