I think that's a bit of an open issue - DCP-o-matic can only adjust these settings per file/content, not for every individual caption. However, the XML sub format allows to adjust every aspect for every caption individually.
So, what should DCP-o-matic do if an XML file contains these tags? How do you decide wether you want to pass through all the original tags, or wether you want to override all with a single setting?

• Carsten

As a beginning, I think it would make sense to recalculate the vertical position of the upper line(s) of multi-line subtitles based on the line spacing factor when they reside in the lower half of the image and vice versa.
From time to time I encounter poorly made subtitles as these:
<Language>Danish</Language>
<Font Italic="no" Color="FFEBEBEB" Effect="border" EffectColor="7F101010" Size="32">
<Subtitle SpotNumber="1" TimeIn="00:00:23:167" TimeOut="00:00:29:219" FadeUpTime="0" FadeDownTime="0">
<Text HAlign="center" HPosition="0" VAlign="top" VPosition="93">Hun sagde engang: "Når man læser</Text>
<Text HAlign="center" HPosition="0" VAlign="top" VPosition="97">en historie, flytter man ind i den."</Text>
</Subtitle>
<Subtitle SpotNumber="2" TimeIn="00:00:30:010" TimeOut="00:00:36:146" FadeUpTime="0" FadeDownTime="0">
<Text HAlign="center" HPosition="0" VAlign="top" VPosition="93">"Bogens omslag er som et tag</Text>
<Text HAlign="center" HPosition="0" VAlign="top" VPosition="97">og fire vægge: et hus."</Text>
Here I face two problems:

• 3% and 7% is too little for some of our curved screens and for some reason I cannot make the projection equipment lift the subtitles.
• The font size 32 is on the small side (the most common I see is around 42), but if I the scale up using X and Y scale in DOM, the line spacing gets very small (as if DOM keeps the vertical position fixed regardless of X-Y scaling)
  Problems like this is file-wide and therefore being able to change line spacing on file basis would do the trick for me.
  /Christian