Annot a1 = page.getAnnot(i);
a1.setColor(new ColorPt((0/255.0), (0/255.0), (255/255.0)), 3);
a1.refreshAppearance();
if(a1.isMarkup())
{
Annots.Markup mk = new Annots.Markup(a1);
mk.setInteriorColor(new ColorPt((0/255.0), (0/255.0), (255/255.0)), 3);
a1.refreshAppearance();
}