I have a document that I need to export, but in the document are gif images of (straight) farily simple line drawings. One line in each drawing is red, and the rest are gray. I'd like to export the document and have the PDF be black and white (or grayscale, if that allows people to see the formerly red lines as darker than the others). I don't know if this is possible, but it's really necessary for work. If I can do it, fine, and if I can't, any recommendations on where/who to turn to?
Thanks in advance,
Ideally you'd open the GIFs up in Photoshop and convert them to greyscale there, where you'd get ultimate control over your conversion settings.
InDesign can't export to greyscale directly but you can convert it afterwards in Acrobat. There's a description of how to do it here.
Try exporting the page to a PDF/X-4, open that in PS and add a Black & White adjustment layer—then you can control the red value relative to the gray via the Reds slider
Thanks for the helpful answers! One of those two sounds about right.