PDFSaveUseDPI example for Visual C++ 5.0 and later
ILEADRasterIO *pRasterIO=NULL;
CoCreateInstance(CLSID_LEADRasterIO, NULL, CLSCTX_ALL,
IID_ILEADRasterIO, (void**)&pRasterIO);
//Use image DPI when saving as PDF
pRasterIO->PDFSaveUseDPI = TRUE;
//Save image as Raster PDF with CCITT G4 compression
pRasterIO->Save(m_LEADRasterView1.GetRaster(),
"c:\\temp\\tmp.pdf",
FILE_RAS_PDF_G4, 1,
(QFactorConstants)1, SAVE_OVERWRITE);
pRasterIO->Release();