is it possible to change the color in a pdf
Print color as black (Acrobat Pro, Pro Extended, and 3D Version 8 only | Windows only) On Windows, you can print all of the non-white colors in your PDF file as black, resulting in a simple monochrome printout. Printing as black is useful for printing PDFs that contain text only, or for printing engineering drawings that have lightly colored lines. Choose File > Print. Select Print Color As Black.