PDF imported into Inkscape -> re-export into PDF very pixelated
I have a somewhat absurd workflow which can't easily be altered due to very custom and complex software. This software can only output PDFs, but in high rest (600 dpi).
When I import these PDFs into Inkscape, resolution looks great. I add some more text, other (svg) images etc. However, when I export this as a pdf, the parts which already came from the orignal pdf look very very pixelated. The remaining images which were imported from svg files and any other shapes etc. which I added look completely fine.
Can someone help me understand what's going on? Why does the high-res PDF component look good in inkscape but export so badly?
Any help would be really appreciated!