two simple questions on presentations

two simple questions on presentations

[Pablo Rodríguez]

Dear list,

sorry for asking the following questions, but I wasn't able to find the
answers on the reference manual, the wiki or the command list.

I wanted to make some cards (and I'm interested also in this features
for presentations) that have the following features:

-Everything in the cards is centered both horizontally and vertically.

  \setupalign[lohi] doesn't work outside frames or similar and
  \setupalign[middle] centers only horizontally.

-Page background colors that can be changed from a given point to the
rest of the document or the next page background color change.

  \setupbackgrounds[page][background=color, backgroundcolor=blue] sets
  the background color for all pages.

How could I get both features?

Many thanks for your help,


Pablo
-- 
http://www.ousia.tk
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