How do I render a PDF to a transparent bitmap?

Q: I would like to use PDFTron SDK to render a PDF page to a bitmap.
However the resulting image needs to have alpha channel so that I can
blend it with a backdrop bitmap. This means that page background must
be trasparend and not solid white. How do I do this with PDFNet?

A: As a starting point you may want to take a look at PDFDraw sample
project (

To render a PDF page with trasparend background (instead of solid
white), use pdfdraw.SetPageTransparent(true). For example:

pdfdraw.Export(page, "my.png");

Please let me know if this helps and if you have any other questions.