Convert a Grayscale Photo to RGB so that iPhoto will Import It

Update 2009/12/16: I wrote a more recent post about using Preview to convert a grayscale photo so that iPhoto will import it. That method is simpler. This method is better if you have a large number of grayscale photos to import.

Install ImageMagick.

convert photo_from_iphoto.jpg srgb.icm
convert photo_as_grayscale.jpg -profile srgb.icm photo_as_srgb.jpg