Panasonic AGDVC200 - DV CAMCORDER Інструкція з експлуатації Посібник з експлуатації - Сторінка 20
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White balance and black balance adjustment
Better pictures will be produced by performing the white balance
and black balance adjustments in the sequence of AWB (white
balance adjustment) > ABB (black balance adjustment) > AWB.
Normally, there is no need to re-adjust the black balance even when
the power is turned on again.
<Notes>
Even though the brightness under artificial lighting and especially
under fluorescent lights and mercury lamps may appear to be
constant, the strengths of the red, green and blue colors change in
synchronization with the power line frequency. Particularly in areas
where this frequency is 50 Hz, the unit's vertical sync frequency
(approx. 60 Hz) and the lighting frequency (50 Hz) will be subject to
mutual interference, causing the color phase to change as time
passes and flicker to be generated. This makes it impossible to
attain the white balance properly. It is recommended that the white
balance be attained using the settings shown in the table below.
Power line frequency
50 Hz
60 Hz
Automatic white balance adjustment
1
Set the switches to the positions shown in
the figure.
1 Set the WHITE BAL switch to A or B.
2 Set the OUTPUT/AUTO KNEE switch to CAM.
3 Normally, set the GAIN selector switch to 0 dB.
If it is too dark at this setting, set the gain to a more
appropriate level.
4 Set the CC/ND filter selector knob to the position
corresponding to the lighting conditions.
CC/ND filter
selector
knob
AUTO W/B BAL
GAIN selector switch
switch
2
Erect a white pattern at a location subject
to the same conditions as the light source
illuminating the subject, zoom in, and fill
the screen with white.
Something white (a piece of white fabric or a white wall) near
the subject can be used instead. The required size of the
white object is shown in the figure below.
At least one-fourth of the screen width
At least one-fourth of the screen height
<Note>
Do not allow any high-brightness spots inside the screen.
Shutter speed
1/100
OFF
WHITE BAL
switch
OUTPUT/AUTO KNEE
switch
20
3
Adjust the lens iris.
4
Push the AUTO W/B BAL switch to AWB
and release it.
The switch returns to the center, and the white balance is
automatically adjusted.
5
A message corresponding to the AWB
execution status appears inside the
viewfinder.
For details, refer to the viewfinder displays (page 16).
<Notes>
≥When the gain selection value has been changed, ensure that
white balance is attained. This will ensure better pictures.
≥If the black balance adjustment was not completed without an
error, an error message appears inside the viewfinder. Try
performing the adjustment again.
If the error message persists even after another attempt at
adjustment, consult your dealer or a Panasonic Service Center
representative.
<Reference>
If there is no time to adjust the white balance, set the WHITE BAL
switch to PRST. The white balance will be attained for the filter
according to the FILTER control (outer) setting position.
The automatic tracking white balance operation is performed when
ATW has been set ahead of time for the A, B and PRE positions of
the WHITE BAL switch: this comes in handy at such a time.
Automatic black balance adjustment
The black balance must be adjusted in the following cases.
≥When the unit is to be used for the first time
≥When the unit is to be used after it has not been used for a
prolonged period
≥When the unit is to be used where the ambient temperature has
changed significantly
≥When the gain selection value has been changed
≥When the MASTER GAMMA setting has been changed
1
Push the AUTO W/B BAL switch to ABB
and release it.
The switch returns to the center, the iris is automatically set to
the shielded mode, and the adjustment is performed.
2
A message corresponding to the ABB
execution status appears inside the
viewfinder.
For details, refer to the viewfinder displays (page 16).
<Notes>
≥If the black balance adjustment was not completed without an
error, an error message appears inside the viewfinder. Try
performing the adjustment again.
If the error message persists even after another attempt at
adjustment, consult your dealer or a Panasonic Service Center
representative.
≥The gain switching circuit is automatically switched while the black
balance is being adjusted. Although flicker or noise may appear
on the viewfinder screen, this is not indicative of malfunctioning.