# ACTION-216: Review implementation of issue-259 so we can close or refine

## Review implementation of issue-259 so we can close or refine

- State:
- closed
- Person:
- Pierre-Anthony Lemieux
- Due on:
- October 10, 2013
- Created on:
- October 3, 2013
- Related emails:
- {minutes} TTML Meeting of 24/10/13 (from glenn@skynav.com on 2013-10-24)
- RE: TTML Agenda for 24/10/13 (from mdolan@newtbt.com on 2013-10-23)
- TTML Agenda for 24/10/13 (from nigel.megitt@bbc.co.uk on 2013-10-23)

## Related notes:

For scalar values, suggest:

"then a presentation processor must use the closest supported value unless computed value is equidistant from two supported values, in which case the processor must use the one of the two supported valued that is closest to +infinity, i.e. round half up"

For a vector value, e.g. extent, suggest treating each vector coordinate separately as a scalar per the above.

For <color>, suggest

(i) treating alpha as a scalar, separately from rgb

(ii) for <rgb>, "then a presentation processor must use the nearest supported value of <rgb> in the euclidian (r,g,b) space unless the computed value is equidistant from two supported values, in which case the processor must use the one of the two supported values farthest from (0,0,0) in the euclidian (r,g,b) space."

Display change log.