Re: ISSUE-284: value of lineHeight [TTML2]

I'm not objecting to revisiting it.


On Fri, Oct 11, 2013 at 10:09 AM, Michael Dolan <mdolan@newtbt.com> wrote:

> Glenn-****
>
> ** **
>
> You assumed a cause and effect that was not intended.  The implementations
> have been around a long time.  No one I know used 100% in practice since it
> looked terrible.  The editor’s draft for 120% was the first clear guidance
> for the few that noticed it.  How long it was published is not really
> relevant - it happened and it was noticed.****
>
> ** **
>
> I was asked to raise this issue in yesterday’s meeting in the context of
> overall deterministic layout, so here it is.  And, when we made the
> recommendation of 125%, we agreed we would revisit it in TTML2. ****
>
> ** **
>
> The answer should be guided in my opinion by compatibility with related
> W3C work, aesthetics and common commercial practices. If, in the end, we
> settle on 125%, that’s fine. The point here is that we should revisit it as
> agreed, and in the broader layout context.****
>
> ** **
>
> Regards,****
>
> ** **
>
>                 Mike****
>
> ** **
>
> *From:* Glenn Adams [mailto:glenn@skynav.com]
> *Sent:* Friday, October 11, 2013 8:36 AM
> *To:* Timed Text Working Group
> *Subject:* Re: ISSUE-284: value of lineHeight [TTML2]****
>
> ** **
>
> Given that the 120% only lived in an editor's draft, and only for 12 days
> (from Aug 23 to Sep 04) [1][2], I completely discount implementations that
> want to lock in that behavior. IMO, they should simply change to 125%.****
>
> ** **
>
> TTML2 was already changed to make this normative on Sep 4 [3].****
>
> ** **
>
> [1] https://dvcs.w3.org/hg/ttml/rev/15f347a0d2ef****
>
> [2] https://dvcs.w3.org/hg/ttml/rev/11d2d5dcb5a1****
>
> [3] https://dvcs.w3.org/hg/ttml/rev/0cc9f1196066****
>
> ** **
>
> On Fri, Oct 11, 2013 at 9:11 AM, Timed Text Working Group Issue Tracker <
> sysbot+tracker@w3.org> wrote:****
>
> ISSUE-284: value of lineHeight [TTML2]
>
> http://www.w3.org/AudioVideo/TT/tracker/issues/284
>
> Raised by: Mike Dolan
> On product: TTML2
>
> TTML1SE added a non-normative recommendation for lineHeight:  8.2.12:
> "Note: It is recommended that presentation processors use a computed line
> height that is 125% of the size of the largest applicable font size when
> the value normal is specified. The choice of 125% allows use of a font size
> of 0.8c in order to obtain a line height of 1c."
>
> However, the WG had previously agreed to 120% which was codified in an
> editor's draft after closing ISSUE-275. The issue includes the rationale.
> The Note was a last minute change for the reason stated in the last
> sentence in the note.
>
> Implementations had been developed to roughly 120% which was re-enforced
> by the editor's draft text.
>
> This recommendation should be revisited and normative provisions added to
> TTML2.
>
> This is also related to ISSUE-283.
>
>
>
> ****
>
> ** **
>