Re: [APML] To Robert Reeves...and all

["westergren" <westergren@netzero.net>]

Nicola,
The film test data I have on the Web show a relative color sensitivity, and
indicates whether a particular film and exposure will have even or uneven
color response.  However, my tests compared each film to Kodak PPF400
exposed for 1 second.  PPF400 was a very good film, but is no longer made in
35mm.

Everything Matt BenDaniel said is true about controlling or correcting
color.  My test data may help guide you, but there are many other factors
that also affect the results.  Sorry there's no easy fix, but that's what
makes this hobby interesting and challenging.

Don Westergren

----- Original Message -----
From: "Bert Katzung" <katzung1@attbi.com>
To: <astro-photo@seds.org>
Sent: Tuesday, June 25, 2002 7:50 AM
Subject: Re: [APML] To Robert Reeves...and all


> Hi Nicola:
> Don Westergren has a lot of quantitative data on various films and their
> color shifts. Enter his site at
> http://home.nethere.net/mpd/FilmTestSummary/FilmTestSummary.htm
> Then navigate to the different sections listed at the bottom of that entry
> page.
> Bert
>
> Bert Katzung
> katzung1@attbi.com
> www.astronomy-images.com
>
> ----- Original Message -----
> From: "Nicola Montecchiari" <nmontec@libero.it>
> To: <astro-photo@seds.org>
> Sent: Tuesday, June 25, 2002 7:13 AM
> Subject: [APML] To Robert Reeves...and all
>
>
> > Hi Robert and All,
> >
> > in your website at film test section you give a rough idea of the colour
> > shift of some films. Would it be possible to quantify this shift in RGB
> > format so that I know how much I should correct with Photoshop when I
> > use a film or another?
> >
> > thanks
> > Nicola
> >
> >
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>
>
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