If you put the photos in the PDF, you get them back. Resolution is whatever already lives in the file: no invented megapixels.
Use only your material or licensed work. Pdfmira is not a tool for stripping someone else’s PDF.
Need a picture of the whole spread, type and rules included? That is PDF to JPG or PNG. Vectors will not appear on this table. Empty extraction usually means the page was paths, not placed rasters.
Guest flow: leave the sheet, watch the plate, download. For history and Studio stock, open an account — after, not before.