The
reverse is also easily done;
that
is,
to
have some object slowly
appear against a
constant
background.
For
these shots,
the
camera must
not
be
moved.
GHOSTS
THE
procedure for
making
a picture of, say, a person
who
appears to
be
transparent is very simple.
It
is only necessary to
photograph
the
scene
without the subject present, then
wind
back and
rephotograph
the
scene
with the subject present.
With
each
of
the
two
film-
ings the normal exposure must
be
halved.
If
a scene is
wanted
where
one person is .. solid" and the
other
transparent, the vertical
half-masks
will
be
needed.
The
half
of
the picture
that
is
to contain the
"solid"
subject
should
be
photographed
in
Double exposure,
"Ghost"
effect. the normal way,
with
normaI
exposure. After
winding
back
and changing
the
half-masks,
photograph
the
other
half
as
described
in
the
preceding paragraph. Thus,
the
film
will
be
exposed a
total
number
of
three times for this scene (
wound
back twice).
In
think
-
ing
through
this type
of
shot,
it
can
be
readily seen
that
the
ghost
and
the
solid subject can be either the same person appearing twice
on the film or
two
different people.
CUT-AWAY
VIEWS
CUT-AWAY
or
"X-Ray"
views are particularly useful for industrial and
mechanical pictures.
With
this technique, locations and
workings of
parts can
be
graphically illustrated much more effectively
than
can
even be demonstrated
with
actual models
or
drawings.
Two
techniques are useful for cut-away
motion
pictures. Also com-
binations
of
the
two
techniques often can be used
to
advantage.
62
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