Philips VKR 6865 - Manual (Page 39)

Supplemental information
What is “color temperature”?
Light is composed of various color components in different
proportions. A relationship exists between the temperature of a light
source and the color components of the emitted light: as the
temperature rises, the color of the light varies from red. orange,
yellow, white to blue in that order. "Color temperature" is a value
that expresses differences in color among light sources, measured
in Kelvin. Bluish light has a higher color temperature than reddish
light.
What is “white balance”?
Making the colors look natural on TV is what white balance is all
about. Because a camera is not as adaptable as the human eye. if a
light source is reddish, white subjects in that light are recorded as
reddish. White balance adjustment is performed to compensate for
color temperature variations of light so that whites are reproduced
as white. Correct white balance makes all other colors correct. The
Camcorder can perform automatic white balance adjustment in the
full-auto mode. Hov/ever. if illumination is insufficient, white balance
adjustment cannot be performed. To obtain correct colors,
therefore, sufficient illumination is essential.
What is “iiluminance”?
Illuminance" is the intensity or brightness of reflected light,
expressed in lux. The Camcorder is designed to provide best
pictures under the conditions of a 700-lux illuminance, although
shooting is possible all the way down to 10 lux. To obtain good
pictures In very bright light, the use of an ND (neutral density) filter
is recommended. (See chart on this page.)
How to get good color pictures
The simplest way is to provide sufficient lighting (close to the
camera's reference illuminance) and accurately adjust the camera
to the color temperature of that lighting. If light sources of different
color temperatures are used together, accurate white balance
adjustment is very difficult. For example, if natural light is mixed
with artificial light, which is likely to occur next to windows, correct
colors of the subject are difficult to obtain. It is recommended in
such cases that curtains in the room be closed to shut out light from
outside. Also, vrhen artificial lighting devices are used, they should
all have the same color temperature. For example, it is
recommended that incandescent or halogen lamps not be used
together with fluorescent lighting.
Color temperatures of various artificial lighting
Type of illumination Color temperature
Tungsten lamp for home use 2.800 К
Tungsten lamp for photographic use
3.200 К
Quartz-halogen lamp
Blue lamp for photographic use 5.000 К
Fluorescent lamp
Warm white 3.500 К
White 4.500 К
Daylight type 6.500 К
illuminance chart
• The values on this chart are approximated to give you a rough
reference.
О) *о
= ф
О о>
2 -о
Unit; Lux
100.000 - • Clear sky. mid-day. under sunlight
(100.000)
ф
ф
э
я
U
• Clear sky (10:00 a.m.) under sunlight
(65.000)
• Clear sky (3:00 p.m.) under sunlight
(35.000)
• Cloudy sky (mid-day) under sunlight
(32.000)
• Cloudy sky {10:00 a.m.) under
sunlight (25.000)
о
я
10.000 -
о
• By the window during the afternoon
(3.500)
О)
с
я
сс
2.000 - • Cloudy sky (one hour after sunrise)
(2.000)
1.000 - • Clear sky (one hour before sunset)
(1.000)
600 - • Counters at department stores
(500 — 700)
500 - • Bowling center (500)
• Office under fluorescent light
(400 — 500)
• Library (400 — 500)
•о
ф
• Direct light of a flashlight at 1 m
distance (250)
ф
тэ 100 - • Streetlights at night (150 — 200)
с 80 -
О)
_|
Minimum lighting
for an object
15 - • Cigarette lighter
(at a distance of 30 cm)
10 - • Candlelight (at a distance of 20 cm)
(10—15)
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