White Shading Adjustment - JVC GY-HD250U - 3-ccd Prohd Camcorder Instructions Manual

e_hd250.book Page 53 Tuesday, October 24, 2006 4:07 PM

White Shading Adjustment

It is necessary to perform this adjustment to the camera
when attaching a lens that is different from the previously
attached lens.
Even if white balance is achieved in the middle of the screen,
it may not be achieved at the top and bottom of the screen.
Greens and magentas may be colored. This is due to char-
acteristics of the lens. Correcting this phenomenon is called
White Shading Adjustment.
Perform this after adjusting white balance.
White shading adjustment is performed on the WHITE BAL-
ANCE menu screen.
Adjustment procedure
1.
White balance the camera.
2.
Set the camera's lens controls as follows:
a. Set the IRIS opening to F4 or greater number.
b. In the case of a zoom lens set the ZOOM at the center
of its range.
3.
Shoot a uniformly lit white sheet of paper and fill the mon-
itor screen with it.
4.
Set the monitor CHROMA level to maximum.
5.
Check the color of the monitor screen. If the top and the
bottom of the monitor screen are white then no adjust-
ment is necessary. If the top of the monitor screen is
greenish and the bottom is reddish or if the top is reddish
and the bottom is greenish then continue with this adjust-
ment.
6.
Adjust the LEVEL G in the SHADING menu item to mini-
mize the color difference between the top and bottom of
the screen.
7.
It is recommended that only LEVEL G be adjusted.
1 Display the WHITE BALANCE menu screen.
Follow the steps in "Setting Menu Screens" on page 75
and proceed as follows.
MENUrCAMERA PROCESS[1/2]rCAMERA PRO-
CESS[2/2]rADVANCE PROCESSrWHITE BALANCE
Setting in the WHITE BALANCE screen is performed as fol-
lows.
Selecting an item
Turn the SHUTTER dial to align the cursor (j) with the
desired item, and press the SHUTTER dial.
• The item is selected and the setting value blinks.
Changing the setting value
Turn the SHUTTER dial to change the blinking value. When
the SHUTTER dial is pressed, the value stops blinking and
the setting is changed.
2 Perform the above steps to set SHADING to MANUAL.
3 Select LEVEL R, LEVEL G, LEVEL B and press the
SHUTTER dial.
• The setting value for the selected LEVEL blinks and
becomes available for changing.
4 Change the setting values for LEVEL R, LEVEL G, and
LEVEL B with the SHUTTER dial while referring to the
monitor.
When setting values are increased, colors at the bottom
of the screen are suppressed and the top is enhanced.
LEVEL R: Adjusts reds.
LEVEL G: Adjusts greens.
LEVEL B: Adjusts blues.
<Range: -128 to +127>
5 Press the SHUTTER dial after changing the setting val-
ues to save in the memory.
6 Press the STATUS button to return to the normal screen.
8.
When white shading adjustment is completed, adjust
white balance again.
X See "White Balance Adjustment" on page 52.
CAUTION
• If the lens setup is incorrect, the white shading adjustment might
result in over compensation. When performing this adjustment,
set the lens to the recommended settings. Do not open the lens
IRIS beyond F4; do not set a telephoto lens to its extreme wide
position or telephoto position.
• White shading occurs due to the optical characteristics of the
mounted lens, it is not a camera malfunction.
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