b. Contour Lighting.
This type of lighting is used to reveal the
volume and contour of forms and shapes.
(1) You change from flat to contour lighting by placing one light
(main light) a little to one side of the camera to produce shadows on the
subject.
(2) Place the second light (fill light) on the opposite side of the
camera and further away from the subject to fill in, but not eliminate the
shadows so detail is still visible.
Light ratios from 2: 1 to 4: 1 are
desirable.
c. Texture Lighting.
To achieve this lighting, move the main light
source away from the camera until the light glances across the surface being
photographed.
The texture of the subject's surface will become readily
apparent.
Adjust the light position to obtain the best rendition of
texture. Sometimes a fill light is used to maintain details in the shadows.
5.
Background.
a. Importance
of
Background.
Your
choice
of
background
in
clinical/medical photography is very important because it can contribute to
or detract from the clarity of the image.
(1) You should not have shelves, cupboards, wall hangings, or other
people in the picture area.
(2) The background should be plain without pattern or design.
(3) Attention must also be given to the color, tone, and texture, as
well as shadows that appear on the background, since they all affect the
scientific value of the picture.
b. Basic Categories of Backgrounds. Backgrounds fall into these basic
categories: colored, white, black, and gray.
(1) Colored backgrounds.
You might think since most clinical
photography is shot on color film that color backgrounds would be suitable.
However, you must bear in mind that the background color and the specimen
colors mutually affect each other.
(a) Sometimes unattractive and disturbing color contrasts may
arise.
Sometimes light reflected off the background onto the subject may
distort its true color.
(b) When choosing a colored background,
choose
one
that
is
complementary to the color of the specimen being
4-4
SS0516
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