Comment 6 for bug 427540

Thank you very much; you're right. If I unmask all the rectangles (4 in this document) then the images are no longer missing. And in Inkscape 0.46, then one has to reverse the colors by:
1. Choose menu item Effects -> Raster -> Negate

However the svg document doesn't require any of this unmasking (or negating), and both the svg and pdf document are created by Inkscape from the same imported image. So why does all this unmasking need to be done but only for the pdf?

Also note that importing a pdf seems to change the font or spacing on images contained within the pdf; see bug #429709 "changed font or text in pdf import".