White Balance Adjustment
4 Arrange a white subject (paper, cloth, etc.) under
To recall a white balance value from memory
Message
Meaning and corrections to be made
Color temperatures of different light sources
V1 |
the same lighting conditions as for shooting, and zoom in on it so that as far as possible the whole screen is white.
The minimum white area requirements for the adjustment are shown in the following figure.
Area of white within this rectangle should be
Center of the screen equivalent to at least 10% of the image area.
Before beginning shooting, set the W. BAL switch to the A or B position. This automatically sets the camera to the white balance adjustment saved in the corresponding memory.
If white balance adjustment cannot be completed automatically
The warning message “AUTO WHITE
WHITE:PRESET
BARS
The W. BAL switch is in the PRESET position.
Move the W. BAL switch to the A or B position.
The camera is outputting a color bar signal.
Move the OUTPUT/DL/DCC+ switch to one of the CAM positions.
Light source
Natural | Artificial |
Clear sky |
|
Light cloud |
|
Cloudy or rainy |
|
skies |
|
| Fluorescent light |
| (daylight white) |
Color temperature (K)
V10,000
8,000
Blue light | 7,000 |
V6,000
5,000
Make the necessary corrections, then carry out the process again.
Warning messages for white balance adjustment
Using the Preset White Balance Settings
Direct sunlight, Mercury lighting | |
noon | Fluorescent light |
| |
| (white) |
One hour after |
|
sunrise or |
|
v
White light
V
approximately | approximately |
70% of the | 70% of the |
height of the | width of the |
image | image |
5 Push the WHT/BLK switch in the WHT direction and release.
Message
AUTO WHITE
:LOW LIGHT TRY AGAIN
Meaning and corrections to be made
Light level is too low.
•Increase the illumination level, open the iris, or use the GAIN switch to increase the video signal level.
•Check the setting of the FILTER control.
•After these checks, retry the adjustment.
The camera provides two preset white balance settings, for instant shooting with approximately the correct adjustment. The preset white balance can be selected between 2200 K and 4300 K when the FILTER control is set to 1 and between 4600 K and 12000 K when the FILTER control is set to 2, 3 or 4 (see page 59).
There are also particular shooting conditions under which the preset values may give better results than the
before sunset | Fluorescent light |
| (warm white) |
| Studio lighting |
| Halogen lamps |
| and video lights |
Thirty minutes | Incandescent |
after sunrise or | lighting |
before sunset |
|
4,000
3,500
v3,200
Yellow light | 3,000 |
V2,500
The white balance adjustment is carried out. During the adjustment the legend “AUTO WHITE
AUTO WHITE | The subject is not white, or the lighting |
level is too high. |
:?? • Use a white subject.
TRY AGAIN | • Lower the illumination level, stop down |
human eye adjustment.
1 Set the W. BAL switch to PRESET.
| Sodium street- |
| lighting |
Sunrise or | Candlelight |
sunset |
|
v |
|
Red light | 2,000 |
After a few seconds the adjustment is complete, and the legend in the viewfinder changes to “AUTO WHITE
the iris, or use the GAIN switch to |
decrease the video signal level. |
• Check the setting of the FILTER |
control. |
• After these checks, retry the |
adjustment. |
2 Set the FILTER control.
The white balance is automatically adjusted for the preset white balance selected in basic menu page 2
Using the ATW (Auto Tracing White Balance) Function
Chapter 5 Adjustments and Settings
AUTO WHITE
The adjustment value is automatically saved in memory A or B as selected above.
To save the white balance adjustment for different lighting conditions, repeat steps 2 to 4 above. You can save two different values for the white balance, in memories A and B.
Note
When using a camera control unit or remote control unit, if the W/B BALANCE switch of the control unit is set to PRESET or MANUAL, it is not possible to carry out white balance adjustment on the camera.
80 | Chapter 5 Adjustments and Settings |
AUTO WHITE
:C.TEMP.LOW
CHG.FILTER TRY AGAIN
AUTO WHITE
:C.TEMP.HI
CHG.FILTER TRY AGAIN
The color temperature is too low. Try the following, in this order of precedence.
(1)If the FILTER control is in position 2, 3 or 4, change it to position 1, then retry the adjustment.
(2)Check that the subject is completely white, then retry the adjustment.
(3)The color temperature may be outside the range of the camera. Fit an appropriate color temperature conversion filter, then retry the adjustment.
The color temperature is too high. Try the following, in this order of precedence.
(1)If the FILTER control is in position 1, change it to position 2, 3 or 4, then retry the adjustment.
(2)Check that the subject is completely white, then retry the adjustment.
(3)The color temperature may be outside the range of the camera. Fit an appropriate color temperature conversion filter, then retry the adjustment.
(see page 59).
Light Sources and Color
Temperature
Adjustment of the white balance to match the light source is essential to ensure correct color rendering. The color of a light source is indicated as a color temperature in kelvins (K). It is higher for bluish light, and lower for reddish light. When the camera is shipped it is adjusted for use with video lights (halogen lamps with a color temperature of 3200 K). For use with other light sources, therefore, adjustment is required.
First use the FILTER control to set the approximate color temperature, then carry out white balance adjustment.
The following table shows typical color temperature values for different light sources.
The ATW function continuously adjusts the white balance automatically to adapt to changes in lighting conditions.
Note
Depending on the shooting conditions, automatic adjustment may not necessarily give optimum results. For the best possible results, use the W. BAL switch.
To use the ATW function
Press the ATW button turning the indicator on. This activates the ATW function, and the ATW indication appears in the viewfinder.
To disable the ATW function, press the ATW button again, turning the indicator off.
Chapter 5 Adjustments and Settings | 81 |
Chapter 5 Adjustments and Settings
