[argyllcms] tiffgamut with L*a*b* files?

Hi,

according the documenation tiffgamut should work for CIELAB Tifs.

I have not been successful so far and tried:

1)
tiffgamut -v Lab.icc PantoneHexachrome.tif

Header:
  size         = 572 bytes
  CMM          = 'appl'
  Version      = 2.0.0
  Device Class = Color Space
  Color Space  = Lab
  Conn. Space  = Lab
  Date, Time   = 16 Feb 1998, 0:00:00
  Platform     = Macintosh
  Flags        = Not Embedded Profile, Use anywhere
  Dev. Mnfctr. = 'appl'
  Dev. Model   = 0x0
  Dev. Attrbts = Reflective, Glossy
  Rndrng Intnt = Perceptual
  Illuminant   = 0.964203, 1.000000, 0.824905    [Lab 100.000000, 0.000498, 
-0.000436]
  Creator      = 'appl'

Unknown: Error - Profile isn't a device profile

2)
tiffgamut PantoneHexachrome.tif
-> gives the short help message

Is it possible to create a gamut file for CIELAB Tifs?

As a workaround I converted all 1024 named Pantone colors in a tif
from CIELAB to ProPhoto and checked if a value is 255. One value was,
so it seems that only one color from the Pantone named colors is
on the border or outside ProPhotoRGB.

Best regards
Peter

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