Section 7
–
Video Input Menu
Copyright 2007-2017 Lumagen, Inc Radiance Pro, Rev 071719
21
Input Picture Controls
HDR Intensity Mapping Controls
HDR Intensity Mapping
is part of HDR
Tone Mapping
which adapts HDR sources to smaller color Gamuts
and lower intensity displays. While the color mapping portion of Tone Mapping is done by calibrating the 3D
LUT for the Rec 2020 color space, the intensity portion of tone mapping can be accomplished using the
Radiance P
ro’s
HDR Intensity Mapping
feature. Tone mapping can be static or dynamic as described
below. See the
HDR Mapping
in the Output setup section and
Calibration
section for more information.
Note:
The defaults for the input memory
HDR Mapping
parameters are very good and for most viewers can be
left at their default values. Adjusting the
Display Max Light
in the output CMS1 menu should be enough
for most viewers. This section is included for those who want to do additional fine tuning, but you can skip
this section if you agree the default input memory HDR Mapping parameters yield a great image. See the
Calibration section for more information.
The command is:
MENU
→
Input
→
Options
→
HDR Mapping
Note:
You can also access the input
HDR Mapping
parameters by pressing the
key, assuming the Menu, or
Info Screen, are not on-screen. Once in this menu press
OK
to accept changes or
EXIT
to discard changes.
As with other commands you must
Save
changes you want to be permanent.
Note:
HDR Intensity Mapping
must be enabled, and the
Display Max Light
set, in the Output CMS menu
(CMS1 by default) under
HDR Mapping
.
Note:
These HDR Intensity Mapping controls are specific to the active Input, and Input Memory, and for some
parameters the content brightness. If you want changes to affect other inputs, or input memories, you need
to adjust for each input and input memory or copy from one input memory to one or all others.
There are two independent sets of HDR Mapping control parameters for some of the controls (Ratio, Shape,
Tran). These are referred to the “Low
-
set”
when peak-brightness is low,
and the “High
-
Set”
when the peak
brightness is high. These are chosen based on the content brightness reported by the source for Static
MaxCLL (Static Tone Mapping) or Radiance Pro’s calculated scene brightness (Dynamic Tone Mapping).
The default HDR Intensity Mapping parameters were chosen to provide reasonable base settings. Many
people find the defaults work very well and no “tweaking” is needed. However, y
ou can change the
parameters to suit your personal preferences and adjust for differences in source material. Since parameters
interact with each other, you should spend time trying different settings for each control to see how each
one affects the image and is affected by the other controls.
As with SDR setup, before making any adjustments you should ensure the
Black Level
is set correctly. See
the
Calibration
Section for more information.
DTM
The Radiance Pro supports two different HDR mapping modes. These are Static Tone Mapping (STM) and
Dynamic Tone Mapping (DTM). This control is used to enable or disable Dynamic Tone Mapping. Note: HDR
Mapping must first be enabled in the
CMS1
→
HDR Mapping
menu.
Static Tone Mapping uses the MaxCLL provided by the source material to set the tone mapping transfer
function to the TV/projector. For HDR10 the MaxCLL is supposed to reflect the maximum brightness in the
program, and be constant for the entire program. Unfortunately, this is often not the case. Because of these
issues Lumagen developed Dynamic Tone Mapping (DTM). DTM calculates the brightness of every frame
and detects scene changes. It then sets the transfer function for each scene based on this data. This has
the benefit of not depending on the
source’s
often incorrect HDR10 MaxCLL, and also allows optimization on
a scene basis so that every scene looks as good the capabilities of the TV/projector allow.