A few more pointers. Convert the PDF to postscript using the pdf interpreter pdftops in the http://www.foolabs.com/xpdf/download.html. In the postscript file you get, setfont is used to change to a font. You change this operator to set not only the font but also the color. Finally, you run the modified postscript file with a real postscript interpreter, such as ghostscript (gs). If you want to produce a pdf file, the utility script a2ping (which also uses ghostscript) may help.

In reply to Re^3: How to change font color in PDF based by font name by ambrus
in thread How to change font color in PDF based by font name by vinothjaguva

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