Who IS Alan? - more below -
----- Original Message -----
From: "Gregory Fraser" <Gregory.Fraser@pwgsc.gc.ca>
To: "List for Photo/Imaging Educators - Professionals - Students"
<photoforum@ase-listmail.rit.edu>
Sent: Tuesday, October 22, 2002 7:12 AM
Subject: Just how do filters work?
> Hi Alan,
-- snip --
> Is it a wavelength interference voodoo or is it just tiny bits of opaque
material in the glass?
>
> Greg
Wavelength Voodo is pretty close. Within the understanding of light as a
wavelngth, the colors can be measured by temperature, as in 'color
temperature.' The filter, simply put, equalizes the temperature so -- in
photography -- it evenly 'toasts' the film particles and makes an evenly
porportioned exposure. (That was VERY simply put.) The different colors
manage different intensities of color temperature depending on what result
you're after.
S. Shapiro
{Submitted for grade.} ;)
>
> > -----Original Message-----
> > From: Alan Zinn [mailto:azinn@netbox.com]
> >
> > Greg,
> > I may have some tinted plex you can have. Is this
> > transparency film? Could
> > you somehow expose a sheet to get a neutral tinted material? I know,
> > off-the-wall...!
>
