Christie APS Series Service Manual page 88

10-7 Black uniformity adjustment
This adjustment improves color uniformity in a black
solid image.
Test pattern for the adjustment
0/255
GAMMA bar
GAMMA No.0 R0 G0
DICOM No.0 R0 G0
ATTENTION
Make this adjustment work after completing
the Color uniformity adjustment.
Remember this adjustment may let contrast
worse. There is a trade-off between the
improvement of the black solid image and the
deterioration of the contrast.
LWU650-APS/LWU530-APS
Service Manual
LWU650-APS / LWU530-APS
Adjustment procedure
1. Display the GAMMA bar with the ▲ and ▼
2. Select "No.0" at the next on the right of
3. Check the image (color) on the screen, and
B0 W0
B0 W0
4. Check the contrast level with test patterns like
5. Set the same value to DICOM No.0, R, G, and B
87
buttons in FACTORY MENU - GAMMA.
"GAMMA", 2nd cell from the left and wait for a
while until the test pattern is displayed. (It is the
no. of GAMMA point to be adjusted.)
change the values of R, G and B cells as following
when the screen does not look sufficiently solid
black.
<When the value of R, G and B cells are all 0.>
Change the value to either "800" or "1000", with
better uniform screen.
<When all the value of R, G and B cells are not 0.>
Change the value to either "200" or "400", with
better uniform screen.
NOTE: W value is changed in response to the
values of R, G and B.
a grayscale before finishing this adjustment. If
it is worse than your permissive level, re-set the
values of R, G and B at a smaller number.
NOTE: The bigger the number of R, G and B of
No.0 is, the better the black solid image becomes.
Remember increasing the number lets contrast
worse.
as GAMMA No.0, R, G, and B.
020-001522-01 Rev. 1 (11-2018)
LIT MAN SERV APS Series