I simply use a white plastic drinking cup.
One of those very cheap ones you buy at supermarket.
I put it in front of the lens with transparent tape.
I shoot one picture against main lightsource, completely out of focus.
Like it was taking incident light.
I make white on that.
Those things are made of a plastic whose physical propreiety is also to
be... perfectly white.
If you fisheye-shoot one from inside you have a kind of light dome of
all light sources and principal chrominance of light reflection.
You don't need anything else.
Georgia Real Tours ha scritto:
>
> On 3/9/08, Rik Littlefield <#removed#
> <mailto:rj.littlefield%40computer.org>> wrote:
> >
> > --- In #removed#
> <mailto:PanoToolsNG%40yahoogroups.com>, "johncharlesriley"
> > <johnriley@...> wrote:
> > >
> > > >
> > > > Using black velvet this way is a very clever trick.
> > > > What happens, I believe, is that the "gray" appearance
> > > > is caused by a myriad of specular reflections
> > > > from the surfaces of the fibers. Specular
> > > > reflections are always non-colored, so indeed
> > > > this method should produce a very neutral gray
> > > > as long as the body of the fibers is very
> > > > dark in comparison.
> > > >
> > > > --Rik
> > > >
> > >
> > > Sorry, I have to jump in here. I am not sure what
> > > you might be thinking of, but specular reflections
> > > have the same color as the incident light.
> >
>
> > together would act like a neutral gray diffuse reflector. Sorry I
> > did not use enough words to make that completely clear.
>
> Oops, my bad. You used enough words; I just failed to use all of
> them. Kinda makes a difference when you get 'em all rounded up. :c\
>
> R~
>
> --
> Mid GA: 478-599-1300
> ATL: 678-438-6955
> garealtours.com
>
>
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