2017

Table Of Contents
Introduced
Version 1.3.
Contains
No content.
Contained By
Log (page 1352)
Attributes
channel Specifies the channel to apply the parameter values to. Possible values are "R", "G", and "B".
Optional. If it is omitted, the values are applied to each of the RGB channels.
gamma Combined film and video gamma (contrast in log space). A typical value is 0.6.
refWhite Value in log space that maps to highlight in linear space. Specified on a 10-bit scale (e.g. 685 is
typical).
refBlack Value in log space that maps to shadow in linear space. Specified on a 10-bit scale (e.g. 95 is typical).
highlight Value in linear space that maps to refWhite in log space. Specified on a floating-point scale (e.g.
1.0 is typical). Note that log values above refWhite are not clamped and will map to values above highlight
in linear space.
shadow Value in linear space that maps to refBlack in log space. Specified on a floating-point scale (e.g. 0.0
is typical). Note that log values below refBlack are not clamped and will map to values below shadow in
linear space (possibly even negative).
Example
All Channels
<ProcessList id="19510ea6-69a0-4d3d-bc75-d0b36d458f62" name="Log op 1"
version="1.3">
<Log inBitDepth="16f" outBitDepth="12i" style="linToLog">
<LogParams gamma="0.6" refWhite="685" refBlack="95" highlight="1.0"
shadow="0.0005"/>
</Log>
</ProcessList>
Separate Channels
<ProcessList id="19510ea6-69a0-4d3d-bc75-d0b36d458f62" name="Log op 1"
version="1.3">
<Log inBitDepth="16f" outBitDepth="12i" style="linToLog">
<LogParams channel="R" gamma="0.5" refWhite="685" refBlack="95"
highlight="1.0" shadow="0.0005"/>
<LogParams channel="G" gamma="0.6" refWhite="685" refBlack="95"
highlight="1.0" shadow="0.0005"/>
<LogParams channel="B" gamma="0.65" refWhite="685" refBlack="95"
highlight="1.0" shadow="0.0005"/>
</Log>
</ProcessList>
1354 | Chapter 25 Colour Management