Ruled tables with visible gridlines are usually reconstructed as real PDF tables. Tables aligned only with whitespace are often read as plain text columns, because there is no visual boundary for the layout analyser to detect.
The embedded picture is inserted at its original resolution and only scaled for display. Because PDF ገጹን ያስተካክላል፦ ፊደላት፣ ቬክተሮች፣ ራስተር ምስሎችና የጽሑፍ ኮርዲኔቶች ተቆርጠዋል ስለዚህ ማንኛውም አንባቢ እኩል ቅርጸት ያያል, the document may recompress on save depending on the application settings, which is why a very large photo can look slightly softer after a round trip.