pdfCheckPageTransparencyUsage
Analyze a page for transparency usage.
int pdfCheckPageTransparencyUsage(PDFHandle pdf, int page)
The pdfCheckPageTransparencyUsage function analyzes the specified page
in the PDF file, and returns 1 if the page uses transparency, or 0 if
the page does not use transparency.
C:
int transparency;
transparency = pdfCheckPageTransparencyUsage(pdf, pageNum);
if (transparency) {
....
} else {
...
}