Image from Clipboard - format

It appears Scrivener by default pastes raster images from the clipboard in TIFF format, sometimes as PICT. Just in case this is a matter of a simple switch setting … could this be changed to a format like PDF or PNG, better in terms vector-capable and with better compression for use by other tools? In addition, TIFF and PICT both have problems with MMD->Latex->PDF downstream tools.