"green" is not quite green

[mikedo]

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.

[nigelmegitt]

This has been raised and discussed before I believe. There is in fact a named color equivalent to full luminance green, which is lime, which is also a named CSS color. See https://www.w3.org/TR/ttml1/#style-value-namedColor :

<namedColor>
  : "transparent"                           // #00000000
...
  | "lime"                                  // #00ff00ff

[mikedo]

Yes, there was a long discussion (I started it in fact). (Apologies for forgetting about "lime" and that distraction.) But my main point is that "green" is not green, at least like the way other colors are defined. And, it is a common mistake to think it is. And a Note would be helpful I think. Putting a Note in TTML1/TTML2 would be good. Using "lime" in the examples (rather than "green" or "#00FF00") would also be good.

[skynavga]

Sure, we can add a note and change the examples.

…

On Mon, Dec 19, 2016 at 11:12 AM, Michael A Dolan ***@***.***> wrote: Yes, there was a long discussion (I started it in fact). (Apologies for forgetting about "lime" and that distraction.) But my main point is that "green" is not green, at least like the way other colors are defined. And, it is a common mistake to think it is. And a Note would be helpful I think. Putting a Note in TTML1/TTML2 would be good. Using "lime" in the examples (rather than "green" or "#00FF00") would also be good. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#190 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAXCb7XbDSfH4YFHONDeW52pVXjmsXRvks5rJskagaJpZM4LQ7xh> .