[argyllcms] CMYK and linux

I have what should be a simple question:
What program can I use under linux to see whether a picture is CMYK or RGB ?

I have a lot of images on my computer. Some of them are CMYK, some are RGB. 
The problem is, I don't know which ones are what. My local photo lab seems to 
be unable to reproduce CMYK images on paper (what an upside-down world eh ?)

So basically, I would like to open an image, and read in it's properties or 
something whether it's CMYK or RGB.

I tried several programs, but until now haven't found one in which I can read 
the colour space:
* Gimp, Cinepaint: they both seem to implicitly convert the image back to RGB 
without a mention of CMYK
* Kuickshow, KView and Gwenview can display the images but don't provide 
colorspace information
* Digikam en ShowFoto give me "Color mode unavailable"
* F-spot gives always RGB for tif images, and nothing for JPG's

So I don't know. Any suggestions ? Does one of the Argyll tools provide this 
info ?

Thank you,

Geert

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