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Re: [imsc] "green" is not quite green

From: Glenn Adams <glenn@skynav.com>
Date: Mon, 19 Dec 2016 11:10:28 -0700
Message-ID: <CACQ=j+cvYHTQ1XY2=p4x+WK4-xKHRapHHGfjf=WEACe1xbs+7g@mail.gmail.com>
To: Michael A Dolan via GitHub <sysbot+gh@w3.org>
Cc: TTWG <public-tt@w3.org>
Full luminance green is called "lime".

On Mon, Dec 19, 2016 at 9:43 AM, Michael A Dolan via GitHub <
sysbot+gh@w3.org> wrote:

> mikedo has just created a new issue for https://github.com/w3c/imsc:
>
> == "green" is not quite green ==
> A curiosity of named colors (inherited from SVG) is that “green”,
> unlike almost all other named colors, is only half-luminance. There is
>  no named color for full luminance green (although some think it is
> “lightGreen” which is incorrect).  One must use the #rrggbb syntax to
> get full luminance green.
>
> It matters in US closed captions since “green” in CTA-708 is full
> luminance.
>
> Example 12 uses green and it is in fact set by “#00FF00”. It might be
> worth a Note about this peculiarity that "green" is not quite green.
> Or consider elevating to TTML1/TTML2.
>
>
>
> Please view or discuss this issue at
> https://github.com/w3c/imsc/issues/190 using your GitHub account
>
>
Received on Monday, 19 December 2016 18:11:21 UTC

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