PDFSaveUseDPI example for C++ Builder
void __fastcall TForm1::Button1Click(TObject *Sender)
{
//Use image DPI when saving as PDF .
LEADImage1->PDFSaveUseDPI= True;
//Save image as Raster PDF with CCITT G4 compression
LEADImage1->Save ("c:\\temp\\test.pdf", FILE_RAS_PDF_G4, 1, 1, SAVE_OVERWRITE ) ;
}