Gamma Correction Adjustment; Knee Point/Knee Slope Adjustment - Sony Digital HDVS HDC-900 Maintenance Manual

6-5. Video System Level Adjustment (When using the Setup Menu)

6-5-10. Gamma Correction Adjustment

Equipment: Waveform monitor (R, G, B)
Test Point: HD SERIAL DIGITAL OUT connector
Object: Grayscale chart
Preparations
. Menu setting:
MENU: PAINT
PAGE: SW STATUS
KNEE → OFF
ITEM:
GAMMA → OFF
ITEM:
. Shoot the grayscale chart so that the chart frame is
aligned with the underscanned monitor frame.
. Iris of the lens: A = 700 ± 20 mV
A
Adjustment Procedures
1. Adjust the white balance.
AUTO W/B BAL switch (front panel) → WHT
2. Adjustment item:
MENU: PAINT
PAGE: GAMMA
ITEM: LEVEL
Adjust the cross points B of the
Specification:
gray scale for preferred level for
R, G and B respectively.
In case of all cross points for R, G
and B adjust simultaneously,
adjust its using the Master.
6-18 (E)
B

6-5-11. Knee Point/Knee Slope Adjustment

Equipment: Waveform monitor (R, G, B)
Test Point: HD SERIAL DIGITAL OUT connector
Preparations
. GAIN switch (side panel) → M (+6 dB)
. Menu setting:
MENU: PAINT
PAGE: KNEE
KNEE → ON
ITEM:
TEST → 1
ITEM:
Adjustment Procedures
1. Adjustment item:
MENU: PAINT
PAGE: KNEE
SLOPE M → +99
ITEM:
2. Adjustment item:
MENU: PAINT
PAGE: KNEE
ITEM: POINT
Specification: Adjust the levels A for preferred
level for R, G and B respectively.
In case of all levels for R, G and B
adjust simultaneously, adjust its
using the Master.
(Reference value: A = 686 mV)
A
HDC-900/950 MM