04-11-2012, 08:25 PM
[quote name='Brightcolours' timestamp='1334132119' post='17431']
Mr Adams did not get 15-16 EV from 10EV film. He used black and white film, which (depending on which type/brand/era) will have upto 14EV. But that 14 (or 10 or whatever) EV is what can be measured after development. and that is then at a set development time. After the development, that is than that. No way to get more DR in post processing. However, Mr. Adams did something quite particular during development of the film. He used large format cameras, so he had large format negatives. He developed parts of one negative in different durations. So, lighter parts in the photo he let develop for a different time than darker parts. This then resulted in the film showing highlights darker than with normal development and deep dark lighter than with normal development, extending the DR.[/quote]
AFAIK, he developed a negative according to exposure (over or under) in order to obtain a tonal curve centred around the subject of interest, all the same, because with negatives one cannot see what one is doing. Even a red bulb creates a veil on a negative, especially at the development times required.
It is all about knowing exactly how much compression or stretching of the tonal curve one gets with a specific developer in a specific solution (stronger or weaker solutions) at different devlopment times. All this to get this perfect tonal curve for a specific subject, or rather, previsualized image.
One does wave these cut-outs in the projected beam of light, moving them slightly, in order to make sure there are no sharp transitions, to avoid the edges of th ecut-outs from being seen in print. This is an effect that is relatively easily copied in post-processing software for digital.
Kind regards, Wim
Mr Adams did not get 15-16 EV from 10EV film. He used black and white film, which (depending on which type/brand/era) will have upto 14EV. But that 14 (or 10 or whatever) EV is what can be measured after development. and that is then at a set development time. After the development, that is than that. No way to get more DR in post processing. However, Mr. Adams did something quite particular during development of the film. He used large format cameras, so he had large format negatives. He developed parts of one negative in different durations. So, lighter parts in the photo he let develop for a different time than darker parts. This then resulted in the film showing highlights darker than with normal development and deep dark lighter than with normal development, extending the DR.[/quote]
AFAIK, he developed a negative according to exposure (over or under) in order to obtain a tonal curve centred around the subject of interest, all the same, because with negatives one cannot see what one is doing. Even a red bulb creates a veil on a negative, especially at the development times required.
It is all about knowing exactly how much compression or stretching of the tonal curve one gets with a specific developer in a specific solution (stronger or weaker solutions) at different devlopment times. All this to get this perfect tonal curve for a specific subject, or rather, previsualized image.
Quote:In post processing (putting that negative as positive in print on paper) one then has to compress that very large DR into a very narrow DR. This is done by letting parts be exposed longer (burning) and parts be exposed shorter (dodging) during exposure of the photo paper. One does this by putting cut outs over the paper as masks.
One does wave these cut-outs in the projected beam of light, moving them slightly, in order to make sure there are no sharp transitions, to avoid the edges of th ecut-outs from being seen in print. This is an effect that is relatively easily copied in post-processing software for digital.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....