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Tips for Mastering In-Camera,Double Exposure Portraits



 
 
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Old January 19th 19, 05:35 PM posted to rec.photo.digital
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Default Tips for Mastering In-Camera,Double Exposure Portraits

In article , Eric Stevens
wrote:

Most of us, who take other than
line prints, end up with shades of gray in there images.

which is the result of individual silver halide crystals being exposed
or not exposed.

The size of the developed silver crystal depends upon the number of
atoms which were originally sensitised. Normally it takes at least 4
but it can be many more. Image density depends upon both the number of
crystals developed/sq mm and the size of the crystals.


otherwise known as film grain. faster film has larger crystals,
resulting in grainier images.

Don't bother ...


i will anyway.


To your regret. See http://www.tmax100.com/photo/pdf/film.pdf

"The purpose of this complex essay is to demonstrate the following:
€Fundamental film particles (silver particles) are distinct from
film grain
€Silver particles are an order-of-magnitude smaller than common
film grain
€Film grain is a perceived property; due to visual clumping of
smaller particles through emulsion
€Resolution of film is related to the size and distribution of
fundamental particles in the emulsion
€Film grain limits the ability of the smaller ³fundamental
particles² to resolve image detail
€Imaging film grain is an inadequate method of determining the
resolution of a film."

Film grain and crystals are not synonymous.


i didn't say they were.

But then you always knew that ... or else it's wrong.


i do, except it isn't the issue.

Don't bother.


oh, but i will.

once again, you don't understand what is being discussed, so you argue
against something else entirely.

it's very simple: silver halide crystals are either exposed or they're
not, and after being developed, they're black or their not there
(removed by fixer). in other words, binary. on or off. 1 or 0.
 




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