On 2017-01-20 03:53 AM (-4), Thomas de Groot wrote:
> On 20-1-2017 5:35, Cousin Ricky wrote:
>>
>> #macro DotGray (Color)
>>   #local C = color Color;
>>   (0.2126 * C.red + 0.7152 * C.green + 0.0722 * C.blue) // ITU-R BT.709
>> #end
>
> [scribbles with pencil on a greasy scrap of wrapping paper, and tacks it
> to an overweight folder]
>
> Done!

Ah, and fortunately for those of you not under Donald Trump's 
jurisdiction, this version also works:

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

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