I'm currently creating a poster (size A0) in PowerPoint 2013 and want it to be in the best quality possible. I used vector images where possible, but for some images I had to use raster graphics.
Now my problem is, that power point samples them down quite a lot and I see no way of preventing this. I just drag and drop the image on my poster, rescale it appropriately and then export the file as PDF. Ideally I would like the picture to be embedded in the original (full) resolution in the pdf, but if there is no way of doing it, I would also be ok with having it resampled with a sufficient high (say 300) dpi rate. How can I achieve that?
I already tried to change the DPI in the registry, which did not help. Also I noticed that the image already looks bad inside PowerPoint and that die file size of the .pptx is far to small, so there is already something going wrong during the import.