On 20-1-2017 22:04, Cousin Ricky wrote:
> 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
>

Obviously. I shall use the other one in solidarity.

-- 
Thomas

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