I have an Impress file in which text fades to light gray as subsequent
text-boxes appear on the screen. (Process: Select text box, from the Task Pane
double-click the chosen item, in "Effect Options" "After Animation" select "Dim
with color"; select Light Gray as Dim Color.)
This works perfectly well in ODP format, but if I then export to Powerpoint, the
Dim color consistently changes to a gray-blue custom color. If, on the other
hand, my Dim Color in Impress is red, in Powerpoint export it dims to black. It
seems that "Dim with Color" settings are not consistently exported to
Powerpoint. I have the files to illustrate the problem if someone wants them.