Black Stretch; Knee - GRASS VALLEY LDX 86WorldCam User Manual

Press the GAMMA button, the NEXT button, the NEXT button again and switch on
OCP
CONTRAST. Select SHADOWS, MIDTONES or HIGHLIGHTS to adjust the luminance level for
each range between 0 and 99.
CAM
In the camera menu, navigate to the CREATIVE CONTROL > LEVELS > CONTRAST menu and
switch CONTRAST on. Use the SHADOWS, MIDTONES or HIGHLIGHTS items to adjust the
luminance level for each tonal range between 0 and 99.
Values below 50 decrease luminance levels while values above 50 increase levels.
☞ ☞
Note Note
Contrast adjustment is always applied after Gamma.

4.4.2 Black Stretch

The Black Stretch function changes the level of tones in the shadow areas of the picture
without affecting the rest of the picture.
100
80
60
40
Black Stretch
20
0
0
OCP
Press the BLACK button and switch on the BLACK STR item. Use the BLACK LVL item to
adjust the Black Stretch level from 0 to 99.
CAM In the camera menu, navigate to the PRODUCTION SETUP > LEVELS > BLACK menu and
switch on the BLACK item. Adjust the Black Stretch level from 0 to 99 using the
BLACK STR LEVEL function.
Values below 50 are Black Press, values higher than 50 are Black Stretch.
☞ ☞
Note Note
Black Stretch is applied independently from Gamma.
When Black Stretch is switched on the non-standard indicator in the viewfinder lights (only for
ocular viewfinders).

4.5 Knee

Knee is a function that compresses the wide dynamic range of the video signal coming from
the imager into the more limited video output range.
LDX 86 High Frame Rate/HD/3G/4K Camera Platform User's Guide (v2.0)
Black Press
100
Chapter 4 - Video setup
63