So, I'm a grad student trying to submit a scientific paper for publication. One requirement is that all graphs need to be .tiff with CMYK colors. Graphs were made in R and Inkscape, and that's pretty much everything I've ever used. Googled around a bit, but everyone just talks about photoshop. There's no way my university will spring for a photoshop license for a grad student, nor do I know anyone who has it. Any ideas, preferably free, how this can be achieved? Got them as vector files, currently, easily converted to various other file types... but not .tiff. Thank you very much for any suggestions.