Manualsbrain.com
  1. マニュアル
  2. ブランド
  3. JVC
  4. gy-hm790
  5. ユーザーズマニュアル

JVC gy-hm790 ユーザーズマニュアル

ダウンロード
ページ / 144
44
You need to adjust white shading when you change the lens.
Even if white balance is adjusted in the center of the screen, 
the top and bottom of the screen may not be adjusted.
In this case, green and yellow colors may appear on the 
screen. This is due to the characteristic of the lens. 
Correcting this phenomena is known as white shading 
adjustment.
Perform this adjustment after adjusting the white balance.
1 
Fill the monitor screen with a pattern box of uniform light 
source or white (plain) paper shone with uniform lighting.
2 
Set the control of the camera lens as follows.
A
Set the aperture to F4 or more such that the iris 
achieves optimum brightness.
If the brightness is insufficient even at F4, set to the 
optimum brightness by increasing the lighting.
B
When using a zoom lens, set to the center of the zoom 
adjustment range.
3 
Adjust the white balance of the camera recorder.
4 
Set the chroma level of the monitor to the maximum.
5 
Check the monitor screen.
● There is no need for adjustment if there is no color at the top 
and bottom of the screen.
● If the top of the screen is greenish and the bottom is reddish 
or vice versa, continue this adjustment.
6 
Adjust the white shading.
It is recommended to adjust only G (green).
A
Set [Main Menu] B [Camera Process] B [White Balance] B 
[Shading Mode] to 
B
Select [Adjust] in the [White Balance] menu and press 
the Set button (
R
).
C
Select the item to change with the cross-shaped          
button (
JK
) and press the Set button (
R
).
D
Change the setting value with the cross-shaped                   
button (
JK
) while looking at the evaluated value at the 
bottom right of the LCD monitor or viewfinder screen.
● If the evaluated value of the adjusting channel is larger 
than 0, use the cross-shaped button (
K
) to change the 
setting value so that the value is more or less 
AEvenB. 
Similarly, if the value is smaller than 0, use the cross-
shaped button (
J
) to change the setting value.
(Adjustment range : Min (-128) to Normal to Max (127))
Memo :                                                                                 
● There may be some delay in the changes of the evaluated 
value after pressing the cross-shaped button (
JK
).
● Increasing the setting value suppresses the colors at the 
                                                                                                    
bottom and enhances the colors on top.
E
Press the Set button (
R
) to save the settings after the 
changes are complete.
F
Select [Back] and press the Set button (
R
) to return to 
the [White Balance] menu.
7 
Press the [MENU] button to return to the normal 
screen.
8 
Readjust the white balance. (A Page 42)
Note :                                                                                                
● If the lens setup is incorrect, you may over-correct the white 
shading. Set to the recommended settings for the lens. (Do 
not open the iris more than F4. Do not adjust the zoom lens 
at the telephoto or wide angle end.)
● White shading occurs as a result of the optical characteristic 
                                                                                                    
of the attached lens. This is not a camera malfunction.
Adjusting the White 
Shading
Cross-Shaped 
Button (
JK)
Set Button (
R)
[MENU] Button
[R]
Red adjustment
[G]
Green adjustment
[B]
Blue adjustment
Evaluated value:
A value that compares the average values of the R, G, B 
channels in the evaluated value detection frames at the top 
(Top) and bottom (Btm) of the LCD monitor or viewfinder 
(difference between [Top] and [Btm]).
If [Top] is larger than [Btm], a negative value is displayed. If 
[Top] is smaller than [Btm], a positive value is displayed.
When there is no difference between [Top] and [Btm], 
AEvenB is displayed. Set such that the evaluated value is 
more or less 
AEvenB.
Top
Btm
C D
F
Evaluated Value Detection Frames
Evaluated 
Value