Re: Conversion of 608/708 captions to WebVTT - how to map the colour green

On Wed, Feb 25, 2015 at 12:16 PM, Glenn Adams <glenn@skynav.com> wrote:
>
> On Tue, Feb 24, 2015 at 9:36 PM, Philip Jägenstedt <philipj@opera.com>
> wrote:
>>
>> On Sat, Feb 21, 2015 at 7:10 AM, Michael Borthwick
>> <mb@michaelborthwick.com.au> wrote:
>> > On 08/04/2014, at 1:08 PM, Silvia Pfeiffer wrote:
>> >
>> >> Note: I've made the change to "lime" and updated the related text, see
>> >> https://dvcs.w3.org/hg/text-tracks/rev/07a843b7f31d
>> >>
>> >> Please let me know if there are more changes necessary.
>> >>
>> >> Regards,
>> >> Silvia.
>> >
>> >
>> > Dear list members,
>> >
>> > For those who are interested I have made the 22 minute video of my SMPTE
>> > Australia 2013 talk regarding this issue available online with
>> > appropriate
>> > amendments to reflect the changes kindly made by Silvia last year to the
>> > mapping of green into CSS lime.
>> >
>> >
>> > http://michaelborthwick.com.au/closed_captioning_online_streaming_video_dfxp_webvtt.html
>>
>> Thanks Michael, this was a great talk! I'm not sure why, but I found
>> the trouble with green and conflicting standards very amusing, a very
>> familiar kind of problem.
>>
>> Since WebVTT doesn't have any dedicated syntax for colors it really
>> comes down to the CSS that goes along with the captions, and of course
>> any mapping specs. Unfortunately, I suspect you will not be the last
>> to spend time looking for a suitable green color.
>
>
> Haven't had a chance to watch yet, but from TTML:
>
> <named-color>
>   : ...
>   | "green"                                 // #008000ff
>   | "lime"                                  // #00ff00ff
>   | "olive"                                 // #808000ff
>
>
>>
>>
>> Did you ever hear back from the BBC about which the ultimate colors
>> are? I doubt that #00FF00 is actually used on the Web, it's so bright!
>
>
> Y = 0.299R + 0.587G + 0.114B

Is this BBC green? Multiplying with 255 and rounding, that is rgb(76,
150, 29), assuming it's the same RGB colorspace of course...

In any case, it's a lot nicer than #00FF00, and a bit brighter than #008000.

Philip

Received on Wednesday, 25 February 2015 05:24:40 UTC