[magick-users] Merging greyscales into an RGB

[mattia]

Hello,

This is my first post on the imagemagick mailing list as I begin to use it
for personal research...

I would like to know if there is a way to merge 3 different greyscale images
into a single RGB image...

I cannot figure out if this should be done or not by the convert command
(options -adjoin or -coalesce )

My greyscale images are in PNM format (but I could also have them as TIFFs )

Can anyone point me out the right command?

Best regards

-- 
Mattia