Adjusting The Black Balance And White; Balance - Sony PXW-Z750 Operating Instructions Manual

36
3. Settings and Adjustments
Adjusting the Black Balance and White Balance
To ensure excellent image quality when using
this camcorder, conditions may require that
both the black balance and the white balance
be adjusted.
Black balance and white balance adjustment
values that are automatically set by the
camcorder and the various settings are stored
in the camcorder memory and retained even
when the power is turned off.
Adjusting the Black Balance
The black balance will require adjustment in
the following cases.
ˎ When the camcorder is used for the first ˎ
time
ˎ When the camcorder has not been used for
ˎ
a long time
ˎ When the camcorder is used under ˎ
conditions in which the surrounding
temperature has changed greatly
ˎ When the GAIN selector (L/M/H/Turbo)
ˎ
values have been changed with Operation
>Gain Switch in the setup menu.
It is not usually necessary to adjust the black
balance when using the camcorder after it has
been off.
In automatic black balance mode, adjustments
are performed in the following order: black
set and black balance. Manual black balance
adjustment can be selected from the setup
menu.
Automatic black balance adjustment is
disabled in the following cases.
ˎ During recording ˎ
ˎ During special recording modes ˎ
ˎ When the shutter mode is SLS
ˎ
1
Set the OUTPUT/DCC switch to CAM.
2
Push the AUTO W/B BAL switch to BLACK
and release the switch.
The message "Executing..." appears
during execution, and changes to "OK"
when the adjustment finishes.
Adjustment values are saved to memory
automatically.
[Notes]
ˎ During the black balance adjustment, the iris is ˎ
automatically closed.
ˎ During the black balance adjustment, the gain ˎ
selection circuit is automatically activated so you may
see flickering on the viewfinder screen, but this is not
a fault.
If automatic black balance adjustment
cannot be made
If the black balance adjustment cannot
be completed normally, an error message
will appear for about three seconds on the
viewfinder screen.
Error message Meaning
NG: Iris not Closed The lens iris did not close;
adjustment was
impossible.
NG: Timeout Adjustment could not be
completed within the
standard number of
attempts.
If any of the above error messages is
displayed, retry the black balance adjustment.
If the error message occurs again, an internal
check is necessary.
For information about this internal check, refer to the
Maintenance Manual (option).
[Note]
If the lens cable is not firmly connected to the LENS
connector, it may not be possible to adjust the lens iris. If
this happens, the black balance will be incorrect.
Adjusting the White Balance
Always readjust the white balance when the
lighting conditions change.
1
Set the switches and selectors as shown
below.
ˎ GAIN switch: L (set to a gain value that ˎ
is as small as possible)
ˎ OUTPUT/DCC switch: CAM ˎ
ˎ WHITE BAL switch: A or B ˎ
1)
1) Adjustment values are saved to memory B
only when Operation >White Setting >White
Switch<B> in the setup menu is set to Memory.
2
Set the FILTER knob to suit the lighting
conditions as follows.
3
Place a white test card under the same
lighting conditions as the subject to be
shot and zoom in on it.
Alternatively, any white object such as a
cloth or a wall can be used.
The absolute minimum white area is as
follows.
Rectangle centered on the screen
The lengths of the sides are 70% of the
length and width of the screen. 10% or more
of the surface area of the image within the
rectangular area must be white.
[Note]
Make sure there are no bright spots in the
rectangle.
4
Adjust the lens iris.
Iris adjusted manually: Set the iris to an
appropriate setting.
Iris adjusted using auto iris: Set the
automatic/manual switch on the lens
to automatic.
5
Push the AUTO W/B BAL switch to WHITE
and then release the switch.
The message "Executing..." appears
during execution, and changes to "OK:
(color temperature of subject)" when the
adjustment finishes.
The adjustment values are saved
automatically in the memory selected in
1
step (A or B).
[Note]
The iris may hunt 1) during the adjustment. To
prevent this, adjust the iris gain knob (indicated as
IG, IS, or S) on the lens.
1) Hunting: Repeated brightening and darkening of
the image, resulting from repeated response to
automatic iris control.
For details, refer to the lens operation manual.
If the automatic white balance
adjustment cannot be made
If the white balance adjustment cannot
be completed normally, an error message
will appear for about three seconds on the
viewfinder screen.
Error message Meaning
NG: Low Light The white video level is too
low. Either open the lens iris
or increase the gain.
NG: High Light The white video level is too
high. Either stop down the
lens iris or change the ND
filter.