How to convert PDF to PNG/TIF along with transparency?

[Support]

Q: Hi I came across this article:
http://www.pdftron.com/kb/questions.php?questionid=765
and had a question about it. I need to do the same thing - I am using
PDF2Image (http://www.pdftron.com/pdf2image) to convert my pdf
documents to images, and need transparency. The problem is, I use
iText to create my docs, not PDFNet. You say to use the
PDFDraw.SetPageTransparent() in PDFNet to accomplish this. Switching
to PDFNet is not really feasible for me at this point (thought it
would be nice), but I really like PDF2Image and hope that I can find
my solution to make that work.

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A: You could achieve similar effect using ‘--transparent_page’
option.

For example:

pdf2image --transparent_page -f png my.pdf

In case you need to do anything more complicated, PDFNet SDK
(http://www.pdftron.com) would be the right choice.