Hi Nils,
Thank you for your interest in Syncfusion products.
Essential PDF images are rendered as points not as DPI. Images in Pixels/Inches can be converted to points and are then rendered into PDF as points.
Here is a code snippet:
PdfDocument pdfDoc = new PdfDocument();
PdfUnitConvertor con = new PdfUnitConvertor();
//converts inches to points
float height = con.ConvertUnits(718, PdfGraphicsUnit.Inch, PdfGraphicsUnit.Point);
float width = con.ConvertUnits(1048, PdfGraphicsUnit.Inch, PdfGraphicsUnit.Point);
PointF location = new PointF(0, 0);
SizeF pageSize = new SizeF(width, height);
PdfBitmap s=new PdfBitmap(Image.FromFile(path));
page.Graphics.DrawImage(s,location );
pdfDoc.Save("Sample.pdf");
Here is a sample for your reference:
http://websamples.syncfusion.com/samples/PDF.Windows/73331/main.htmPlease let me know if you have any other concerns.
Regards,
G.Yavana