Christoph mentioned blend_mode elsewhere today. To my knowledge the two 
options blend_mode and blend_gamma are not yet in our documentation for 
3.7.1 and should be I think.

 From the commit there is this:

     Implemented non-linear colour and pigment map interpolation.

     The syntax is changed as follows:

         COLOR_MAP:
           color_map { COLOR_MAP_BODY } | colour_map { COLOR_MAP_BODY }
         COLOR_MAP_BODY:
           COLOR_MAP_IDENTIFIER | [blend_mode INT] [blend_gamma FLOAT] 
COLOR_MAP_ENTRY...

         PIGMENT_MAP:
           pigment_map { PIGMENT_MAP_BODY }
         PIGMENT_MAP_BODY:
           PIGMENT_MAP_IDENTIFIER | [blend_mode INT] [blend_gamma FLOAT] 
PIGMENT_MAP_ENTRY...

     The possible values for blend_mode are as follows:

         0 (default): Colour interpolation is performed working gamma 
space as defined by assumed_gamma.
         1: Colour interpolation is performed in linear colour space.
         2: Colour interpolation is performed in the gamma space defined 
by blend_gamma (defaulting to 2.5).
         3: Chromaticity interpolation is performed in linear space, 
while brightness interpolation is performed in the gamma space defined 
by blend_gamma.

Sorry about the wrapping.

Bill P.

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