Philips VKR 9010 - Manual (Page 38)

Supplemental information
What is “colour temperature”?
Light is composed of various coiour components in
different proportions. A relationship exists between
the temperature of a light source and the colour
components of the emitted light; as the temperature
rises, the colour of the light varies from red, orange,
yellow, white to blue in that order. “Colour
temperature” is a value that expresses differences in
colour among light sources, measured in Kelvin.
Bluish light has higher colour temperature than
reddish light.
What is “white balance”?
Making the colours 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 colour temperature variations of light
so that whites are reproduced as white. Correct white
balance makes all other colours correct. The
Camcorder can perform automatic white balance
adjustment in the full-auto mode. However, if
illumination is insufficient, white balance adjustment
cannot be performed. To obtain correct colours,
therefore, sufficient illumination is essential.
What is “illuminance”?
"Illuminance” (also called ‘luminance’) 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 9 lux. To
obtain good pictures in very bright light, the use of an
ND (neutrai density) fiiter is recommended. (See chart
on the right.)
How to get good colour pictures
The simpiest way is to provide sufficient iighting
(ciose to the camera’s reference illuminance) and
accurately adjust the camera to the colour
temperature of that lighting, if light sources of different
colour temperatures are used together, accurate white
balance adjustment is very difficuit. For example, if
naturai iight is mixed with artificial light, which is
likeiy to occur next to windows, correct colours 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. Aiso, when artificiai lighting
devices are used, they shouid all have the same
colour temperature. For example, it is recommended
that incandescent or halogen lamps not be used
together with fiuorescent lighting.
Colour temperatures of various artificial
lighting
Type of illumination
Colour
temperature
Tungsten lamp for home use 2,800 К
Tungsten lamp for photographic use
3,200 К
Quartz-haiogen 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.
^ (D
^ W
О о
2*0
О)
со
D
75
о
о
Cd
Ф
О)
с
Cd
СП
■а
ф
'со
ф
■и
га
с
га
Unit: Lux
100,000
■
10,000
-
2,000
-
1,000-
600-
500-
100
-
80-
Minimum
lighting
for an
object
15-
10-
• Clear sky, mid-day, under sunlight
( 100 , 000 )
• 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)
• By the window during the afternoon
(3,500)
• Cloudy sky (one hour after sunrise)
( 2 , 000 )
• Clear sky (one hour before sunset)
( 1 . 000 )
• Counters at department stores
(500 — 700)
• Bowling centre (500)
• Office under fluorescent light
(400 — 500)
• Library (400 — 500)
• Direct light of a flashlight at 1 m
distance (250)
• Streetlights at night (150 — 200)
• Cigarette lighter
(at a distance of 30 cm) (15)
• Candlelight
(At a distance of 20 cm) (10 - 15)
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