How to Change img files to PVRTC Compressed format at Runtime?

Unity Engine
,
1

In the U3D Editor, change maps into PVRTC compressed foramt is easy.
but can i do this at runtime?

I mean that :
Save maps(.png or .jpg) in IOS Documents folder,
then load them directly in to the unity App as PVRTC compressed.

2

No, but even if you could, it would take far too long to be useful.

–Eric

3

Thanks a lot for your answer.