On 2017-01-19 10:48 AM (-4), clipka wrote:
> [snip approaches to fixing gory guts of POV-Ray]
>
> Back when 3.7.0 was about to be released, I wasn't prepared to tackle
> either of these approaches.
>
> Now I guess I would be, but as this would imply a change in default
> behaviour of a very common feature for the "assumed_gamma 1.0" mode, I
> don't think the transition from 3.7.0 to 3.7.1 is the right time to do
> it. Even if a simple "#version" statement would fix it, I think such a
> change might be too much of a surprise for the average user, so I prefer
> to postpone it to a bigger version step, possibly 3.7 to 3.8.

I guess it's time (for those of us who use the One True assumed_gamma) 
to add this function to our personal libraries until this issue gets 
sorted out:

#macro DotGray (Color)
   #local C = color Color;
   (0.2126 * C.red + 0.7152 * C.green + 0.0722 * C.blue) // ITU-R BT.709
#end

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