Sorry Mike.
Tiffs and Pngs are not appropriate at all for logos. Quite often we have to have a raster version of a logo traced into a vector format in order to scale it for quality printing at a larger size.
We have reproduced client's logos on everything from pens to large banners with the same PDF vector file. Anywhere from less than an inch to many feet from the same file. Raster formats like Tiffs or Pngs do not work at all for this kind of work.
The reason I looked at this today is we're getting ready to print a batch of dye sublimated gift cards that we received, correctly, as pdfs. Qimage is so great to batch print these but I have to convert 50 ready-to-print pdfs to a raster file first.
I know you created Qimage for printing photos but it works great for graphics too.