Overpint settings: Resolving missing text or wrong color issues

Q: We are using PDFTron SDK to convert PDF to image (jpeg).

On some pages the text seems to be of wrong color or is missing. Could
you please let me know what is the reason of the problem, and how it
can be fixed?

I attached PDF and result image.

A: By default PDFDraw and PDF2Image have "overprint" simulation
enabled. So the generated image is correct assuming that overprint
should be respected.

To disable overprint preview you can use "--noop" (i.e. no overprint
option). In case you need to do the same thing in PDFNet you can use
pdfdraw or pdfview.SetOverprint(false).