Very much so. PDF ilungisa iphepha: ifonti, i-vectors, imifanekiso ye-raster kunye nobeko lombhalo lutshixiwe ukuze wonke umfundi abone ubeko olufanayo. That determines both the headroom available and whether the saving costs you anything in fidelity.
Ingaba kukho into ekhethekileyo kwi PDF endimele ndiyazi phambi kokuba ndicofe?
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Yes — i-PDF yi-object graph, hayi umfanekiso wephepha, ngoko umbhalo uhlala ukhethwa kwaye i-vectors ihlala iqaqambileyo nokuba kwenzeka ntoni kwi-raster equlethe ngaphakathi. It is worth knowing before you overwrite an original you might need again.