rgb:  is a raw image format and not just a normal RGB set of color channels

convert -list format

       RBG* RGB       rw+   Raw red, blue, and green samples
       RGB* RGB       rw+   Raw red, green, and blue samples


use -colorspace RGB to convert to RGB colorspace and any image type 
such as jpg, png, gif, tiff etc


see

http://www.imagemagick.org/Usage/channels/#channels
http://www.imagemagick.org/Usage/channels/#combine_other
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