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Selecting the Gamma
Chapter 3 Basic Adjustments and Settings
3-11 Selecting the
Gamma
You can use User gamma you create in addition to the
built-in Standard gamma and Hyper gamma.
Use the <GAMMA> page of the USER (PAINT) menu for
gamma operations.
<GAMMA> page
Gamma selection is also possible on the gamma-table
selection page of the subdisplay.
3-11-1 Using the Standard Gamma
Standard Gamma is for video and intended to be used
mainly for creating broadcast contents. It is used in
combination with the Knee function that adjusts the
dynamic range of high-luminance areas.
When STANDARD is selected on the first line of TABLE
of the <GAMMA> page, you can select from among the
following standard gamma curves:
It is recommended to use the No. 5 (ITU-R709) curve in
normal use.
As ITU-R709 provides 4.5-times gain around the black,
select the No. 6 (×5) curve when you need higher contrast
around the black.
3-11-2 Using Hyper Gamma
Hyper Gamma enables the wide dynamic range of the
CCD sensors to be reproduced in smooth contrast without
using the knee function.
This camera provides the following eight hyper gamma
choices:
Available Hyper Gamma choices
1) Naming rule: HG + 3 digits of dynamic range value + 1’s digit of white
limit + G + video output value with 18% gray card
For the respective curves, see the next page.
Reproducibility of high luminance areas
You can select the dynamic range from among 325%,
460%, and 800%.
Selecting a wide dynamic range, such as 800%, enables
reproduction of gradation at high luminance. However, the
brightness of intermediate gradation will be lowered.
White limit
You can select either 109% or 100% for the maximum
value of video output (white limit). While reproduction up
to 109% is possible with SDI outputs, only 100% may be
available, depending on the environment of the production
system. In such conditions, select 100% as the white limit.
Midtone
You can select two values for the brightness of
intermediate gradation areas around skin tones. Selecting a
curve for bright intermediate gradation may slightly inhibit
reproducibility of the high luminance.
1
Select HYPER GAMMA on the first line of TABLE
on the <GAMMA> page and select the hyper gamma
curve most suitable to the shooting conditions and
purpose.
Gamma table No. Gamma curve
1 equivalent to SD ENG camcorder
2 equivalent to 4.5-times gain
3 equivalent to 3.5-times gain
4 equivalent to SMPTE-240M
5 equivalent to ITU-R709
6 equivalent to 5.0-times gain
<GAMMA> U19
TABLE :
B
USER
: 1 S-LOG A
TEST : OFF
No.
Name
1)
Dynamic
range
White
limit
Video output with
18% gray card
(video input 20%)
1 HG3250G36 325% 100% 36%
2 HG4600G30 460% 100% 30%
3 HG3259G40 325% 109% 40%
4 HG4609G33 460% 109% 33%
5 HG8000G36 800% 100% 36%
6 HG8000G30 800% 100% 30%
7 HG8009G40 800% 109% 40%
8 HG8009G33 800% 109% 33%
<GAMMA> U19
TABLE :
B
HYPER GAMMA
: 1 HG3250G36
TEST : OFF