Grass Valley OCP 42 User Manual - Manuel (Page 152)

152 Chapter 2 -OCP 42/OCP 50 Operating Instructions
Description of pushbuttons
B1500M24LA
September 2000
THOMSON OCP 42/OCP 50
User manual
2.2.8.8 - KNEE button
Used to make KNEE range adjustments.
These adjustments concern the white compression (knee)
device used to restore the most strongly illuminated parts of
the image over a low dynamic while conserving the colori-
metry of the compressed areas.
Press the button to display the following page:
This page is used to modify the following parameters:
• LEVEL: Compression threshold adjustment in mode
KNEE=MANU or KNEE=AUTO.
• MAN SLOPE: Compression slope in manual mode
(KNEE=MANU).
• KNEE :
- ON: Compressor (Knee) on.
- OFF: Compressor (Knee) off.
ON and OFF switching is obtained directly using the
corresponding button.
• KNEE :
- MANU: The compression start threshold (Knee) is
adjusted by means of the LVL control, the compressor
(Knee) slope is adjustable using MAN SLOPE.
- AUTO: The start of compression (Knee) threshold is
adjusted by means of the LVL control; the slope is
adjusted automatically according to the video level so
as to restore the most strongly illuminated parts of the
picture over a low dynamic.
- AUTOHOLD: The KNEE LEVEL (LVL) and the
KNEE SLOPE are fixed and imposed by the AUTO
position previously selected.
L E V E L MAN S L OP E
X X
ON MANU
KN E E KN E E
SLOPE
LVL
VIDEO OUTPUT
VIDEO INPUT
LOCK
F1
EXIT
NEXT
GAMMA
DETAIL FILTERS
WHITE BAL
LIMIT
ACTIV CCU STATUS BARS SETTING CALL
F2 F3 F4
COLOUR
KNEE
PRESET
BLACK DFZ STORE
RECALL
GAIN
SHUTTER
BLACK BAL
LIMIT
CTRL
DIAG
ON AIR 1 ON
AIR 2
PRE
VIEW
SKIN MEMORY