How to remove color from a pdf

[Janet A. Thompson]

In Acro 7 Pro, we have a diagram with various colors, some of which are yellow! How can we convert all colors to B/W?:) Thanks

[Lukas Engqvist]

There are two ways (or more)
in Acrobat you have a colour converter (printproduction toolbar looks like a gradient yellow to blue) In Destination space choose a grey profile (e.g dotgain 15%).

Or

set up Illustrator as your touch-up program so that you can select your objects/part or choose to edit page, once in illustrator you can select all and choose colours convert to greyscale.

writing this I can think of several more ways, but those are a few to start u off ;P

Lukas