P3D Re: "orange" in negative film

[John Fairstein <jfairstein@xxxxxxx>]

David Clark writes:
"The orange in negative film is a dye applied differently to each color
layer of
the film.  This adjusts for the differences in density between each
layer.  The
fact that different amounts of orange are applied to each of the three
or four
color layers makes it very difficult to remove in Photoshop."

Actually, the "orange" is the masking layer that filters out blue light
for the green and red sensitive layers of the film. Since it is a
filter, it contains no image data. I suspect that there is little
difference in the absorption properties of this masking layer from film
type to film type.