The latest version (0.91) has a handy button next to the font name when you select a text box, which selects all text boxes with the same font. From there you can easily change their color.
(BTW, a warm thank you to the devs for putting in such a useful feature. 0.91 is fantastic.)
However, 0.91 isn't in some distros' package channels yet, so it might take a bit of work to get it going if you're not using that version already.
You might require scripting to batch process all your pages, though, if they live in different files. If they're SVG, it's relatively trivial to do; if you can post a sample file, I can try and suggest a solution.
On April 2, 2015 4:41:15 PM WEST, John Culleton <John@...1668...> wrote:
I have imported a single pdf page from a book. The text is all in blue. How do I convert it to black? I want to keep the text in text form, not bitmap so gimp is out.
I have 200+ pages to process.