POV-Ray: Newsgroups: povray.off-topic: Re: Assumed

POV-Ray : Newsgroups : povray.off-topic : Re: Assumed_gamma and .gray		Server Time 23 Nov 2024 03:24:28 EST (-0500)

From: Cousin Ricky
Subject: Re: Assumed_gamma and .gray
Date: 6 Nov 2024 18:09:24
Message: <672bf724$1@news.povray.org>

On 2021-01-21 17:49 (-4), Cousin Ricky wrote:
> On 2017-01-21 3:53 AM (-4), Thomas de Groot wrote:
>> 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.
> 
> You are hereby released from your solidarity pledge.

Uh...

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From: Thomas de Groot
Subject: Re: Assumed_gamma and .gray
Date: 7 Nov 2024 06:23:26
Message: <672ca32e@news.povray.org>

Op 07/11/2024 om 00:09 schreef Cousin Ricky:
> On 2021-01-21 17:49 (-4), Cousin Ricky wrote:
>> On 2017-01-21 3:53 AM (-4), Thomas de Groot wrote:
>>> 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.
>>
>> You are hereby released from your solidarity pledge.
> 
> Uh...
> 
Yeah...

-- 
Thomas

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From: Bald Eagle
Subject: Re: Assumed_gamma and .gray
Date: 7 Nov 2024 08:15:00
Message: <web.672cbc4b30ab893a3bc22bca25979125@news.povray.org>

Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 07/11/2024 om 00:09 schreef Cousin Ricky:
> > On 2021-01-21 17:49 (-4), Cousin Ricky wrote:
> >> On 2017-01-21 3:53 AM (-4), Thomas de Groot wrote:
> >>> 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)


> >>>>>> 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)


> >>>> #end

Multiple Arithmetical Gray Algorithms!

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