the last project I had while working at Kodak was to create a
characterization target for color negative films, these was geared toward
the portrait and graphics markets

granted with more digital cameras selling then optical cameras, and with
digital projection in cinema, the use of color negative films has gone
down considerably over the the last ten years

but, one advantage of negative films, color or B&W, over transparency
films or digital cameras is exposure latitude, there are certain
situations where you just don't know what the right exposure will be, or
the exposure is going to vary, where you might choose to use a negative
film

I see no one has taken this issue to a manufacturing stage

my approach was to design a target that covered the gamut of the film,
using a film recorder directly on the negative, or using a film recorder
on a transparancy film, that could then be optically printed on the
negative for mass manufacture of the negatives, I believe I used a
10x10x10 RGB grid that was randomized before recorded

the intent of the negative was assumed to be a print on optical paper, so
in order to get colorimetry to mathematically map the RGB scan of the
negative, you would have to print the target on each paper you wanted a
model for

the target had a full range near neutral scale, getting a near neutral
scale required some fundamental characteristics and assumptions of the
behavior of the film with respect to a paper and printer

it was printed such that any expsoure on the negative would register on
the paper, in other words, you would print the target such that the full
dynamic range of the negative would register on the paper

secondarily, the neutral scale on each paper would be balanced to neutral

then the RGB values of the scan could be mapped to the colorimetry of the
scan and encoded in PCS

this approach would allow normal, under and over exposures to be
characterized on the same target, considering printed, it does mean that
ann over or under will not result in full 24bit encoding, but that is the
same as ANY scanner that does not have analog prescan capabilities, which
FEW have



--
Dale
http://www.vedantasite.org

Interesting, so what happened to the project?
Roger

On Mar 27, 5:37 am, Dale Kelly <dale.ke...@comcast.net> wrote:
> the last project I had while working at Kodak was to create a
> characterization target for color negative films, these was geared toward
> the portrait and graphics markets
>
> granted with more digital cameras selling then optical cameras, and with
> digital projection in cinema, the use of color negative films has gone
> down considerably over the the last ten years
>
> but, one advantage of negative films, color or B&W, over transparency
> films or digital cameras is exposure latitude, there are certain
> situations where you just don't know what the right exposure will be, or
> the exposure is going to vary, where you might choose to use a negative
> film
>
> I see no one has taken this issue to a manufacturing stage
>
> my approach was to design a target that covered the gamut of the film,
> using a film recorder directly on the negative, or using a film recorder
> on a transparancy film, that could then be optically printed on the
> negative for mass manufacture of the negatives, I believe I used a
> 10x10x10 RGB grid that was randomized before recorded
>
> the intent of the negative was assumed to be a print on optical paper, so
> in order to get colorimetry to mathematically map the RGB scan of the
> negative, you would have to print the target on each paper you wanted a
> model for
>
> the target had a full range near neutral scale, getting a near neutral
> scale required some fundamental characteristics and assumptions of the
> behavior of the film with respect to a paper and printer
>
> it was printed such that any expsoure on the negative would register on
> the paper, in other words, you would print the target such that the full
> dynamic range of the negative would register on the paper
>
> secondarily, the neutral scale on each paper would be balanced to neutral
>
> then the RGB values of the scan could be mapped to the colorimetry of the
> scan and encoded in PCS
>
> this approach would allow normal, under and over exposures to be
> characterized on the same target, considering printed, it does mean that
> ann over or under will not result in full 24bit encoding, but that is the
> same as ANY scanner that does not have analog prescan capabilities, which
> FEW have
>
> --
> Dalehttp://www.vedantasite.org

On Tue, 27 Mar 2007 08:30:40 -0700, Roger S. wrote:

> Interesting, so what happened to the project?--

I left there in late 1997, I noticed they made some excuses for awhile on
their website, they came out with a target that was kind of like their
optical balance target except it had a greyscale, there was some thinking
at the time from some contingents that perhaps color management was not
neccesary and they could effect management with 1DLUTS and gamma
correction, which is what I assume they (the Professional Division, not
the Graphics Division) is doing now



--
Dale
http://www.vedantasite.org