Panasonic NV-S99A - Manual (Page 35)

■ Manual White Balance Adjustment
With the Manual White Balance Adjustment, the user can adjust the colour compensation for the light source
used for a particular scene. For this adjustment, the Lens Cap is put on the lens and the [W.T] Button pressed,
so the Movie Camera can determine how much the white of the lens cap under the present lighting deviates
from the vaiue for pure white stored in memory. Alternatively, the user can aim the Movie Camera at a pure
white object (e.g. a sheet of pure white paper) instead of using the White Lens Cap.
The chart below shows the range of lighting sources within which the Automatic White Balance Adjustment can
provide accurate compensation. For recording under lighting conditions outside this range, use the Manual
White Balance Adjustment because the Automatic White Balance Adjustment cannot provide satisfactory
results.
■ Colour Temperature and White Balance
The colour temperature of the light source is measured in Kelvin. The higher the Kelvin value is, the more bluish
is the light; the lower the value, the more reddish is the light. This is not directly related to the brightness.
The table below shows the relationship between natural light, artificial light and colour temperature.
Natural Light
Colour
Temperature
Artificial Light
•Blue sky i 10,000 К
1
1 _______________ L„_______________________
•Slightly
ЛЛа
17,000 K~
sky
8,000 K~ :
9,000 к ; *TV screen
•Cloudy Sky 1
(Rain)
1
^
LJ
1
_ _ _ _ _ _ _ _ _ _ _ i_ _ _ _ _
Д ¿i ^ 1
•Sunlight : 5,000 К
j
1
1
1
t
1
1
: «Fluorescent —
4,800 К ; ^vvhile)
_ _ _ _ _ _ _ _ _ _ _ 1 ____________
.1-2 hours after i 3,000 K~
sunrise or before : ^ goo К
sunset I ’
I
2 500K— i • Fluorescent lamp
3,500 К i (not white) or ^
< studio lamp
•Sunrise or I 2,000 K~
sunset
\
2,500 К
I
^2?800^i7 i •Halogen light bulb
1
1
2,000 K~ i ^
2,500 К •Tungsten lamp
1
\
1 ‘Candlelight Q
1
Effect on the picture
If you want to record
under light sources
within this range, use
Bluish Manual White
colour Balance Adjustment. (In
the Auto White Balance
Adjustment, ttie picture
could have a bluish
cast.)
If you want to record under
light sources within this
range, you can use the Auto
White Balance Adjustment.
Whitish
colour
Reddish 'f you wantto record
colour under light sources
within this range, use
the Manual White
Balance Adjustment, (in
the Auto White Balance
Adjustment, the picture
could have a reddish
cast.)
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0
1
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For the following types of scenes, the Automatic White Balance Adjustment cannot provide satisfactory results,
even if the light source is within the range described above. Use the Manual white balance Adjustment instead.
When a Scene is Lit by Several
Light Sources
If there is more than one light
source for a scene, the Movie
Camera cannot decide which of
the stored White Balance
Adjustment settings to use.
Therefore, precise Automatic
White Balance Adjustment is not
possible in such cases.
When recording an Outdoor
Scene from Inside a Building
As the colour of the light entering
through the lens differs greatly
from that received by the White
Balance Sensor, the Automatic
White Balance Adjustment will
compensate for indoor lighting
and this results in unnatural
colours.
When recording in a Very Dark
Place
As the colour information entering
through the lens is greatly
reduced, the Automatic White
Balance Adjustment cannot
correctly compensate for the
colour of the lighting and this
results in unnatural colours.
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