Panasonic NV-VS40B, Руководство по эксплуатации

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68
Glossary (cont.)
∫
White Balance Adjustment
While most recording with a Movie Camera is
probably done outdoors under sunlight, video
recording is also done very often under artificial
light sources, both indoors and outdoors.
However, each of these light sources gives the
subject slightly different colours.
Human Eyes
Human eyes can easily adjust to different kinds of
lighting and see an object with the same colours
even under different lighting.
Movie Camera
Unlike human eyes, the Movie Camera does not
have the innate ability to adapt to changes in
lighting, and they influence the colours being
recorded. Therefore, depending on the light
source, the picture would be recorded with a
bluish or reddish tint. To minimise the influence of
the lighting on the colours of the subject, an
adjustment called White Balance Adjustment is
necessary.
White Balance Adjustment
The White Balance Adjustment determines the
colour of the light and adjusts the colours so that
white remains pure white. As white is the basic
colour of the entire colour spectrum, if white is
reproduced correctly, the other colours are correct
and natural, too.
Auto White Balance Adjustment
This Movie Camera stores the optimum settings
for several common light sources in memory. The
Movie Camera judges the recording situation by
determining the tint of the light received through
the lens and by the White Balance Sensor (p. 4),
and it selects the setting for the most similar tint.
This function is called Auto White Balance
Adjustment.
However, as the white balance settings for only a
few light sources are stored in memory, the white
balance is not correctly adjusted for other lighting
conditions.
For the range of different types of lighting within
which the Auto White Balance Function can
provide precise adjustment, refer to the chart. For
recording under lighting conditions outside this
range, the Auto White Balance Function does not
work correctly, and the recorded picture has a red
or blue cast. However, the same also applies, if
the subject is lit by more than one light source,
even if these light sources are within this range.
∫
Colour Temperature
Every light source has its own colour temperature
measured in Kelvin (K). The higher the Kelvin
value, the more bluish the light; the lower the
value, the more reddish the light. The Kelvin value
is related to the tint of the light, but not directly to
its brightness.
The range
1
indicated in the illustration below
shows the light sources for which this Movie
Camera can provide precise white balance
adjustment and, therefore, natural colours in the
recorded pictures, when using the Full Auto Mode.
For light sources outside this range, adjust the
white balance manually (p. 52). Also, additional
lighting may be necessary.
1
Control range of this Movie Camera’s Auto
White Balance Adjustment Mode
2
Blue sky
3
Cloudy sky (Rain)
4
TV screen
5
Sunlight
6
White fluorescent lamp
7
2 hours after sunrise or before sunset
8
1 hour after sunrise or before sunset
9
Halogen light bulb
:
Incandescent light bulb
;
Sunrise or sunset
<
Candlelight
10 000K
9 000K
8 000K
7 000K
6 000K
5 000K
4 000K
3 000K
2 000K
1 000K