Very much so. I-PNG ayilahleki UKUHLALA nge-8-bit alpha channel epheleleyo kunye ne-16-bit ubunzulu obukhethwayo, ngoko ke ayizukuhlaliswa kwi-re-save kodwa ifumana uninzi kwizinto eziqulethe imifanekiso. That determines both the headroom available and whether the saving costs you anything in fidelity.
Yes — akukho mqhoboshi womgangatho onokuthi uphume embi — i-PNG ijikeleza-ihamba ngokuchanekileyo, ngoko into ekuphela kwayo eyenza utshintsho ibiza ubungakanani befayili. It is worth knowing before you overwrite an original you might need again.
Yintoni impazamo eqhelekileyo xa uxinzelela PNG images?