PDFSaveUseDPI example for Delphi
procedure TForm1.Button1Click(Sender: TObject);
begin
//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);
end;