Hi Graeme, yes I saw it when I was doing troubleshooting, but I didn't completely understand it when I read it. I've just re-read it and I think I understand it better now, this might fix the problem in a more fundamental way. Few questions: 1) My main display is Dell 3007wfp-hc, it's 92% adobe RGB, and I edit in Pro Photo RGB. For the source colorspace, should I be choosing Adobe RGB or Prophoto? I would assume it's Pro Photo Right? 2) there are 3 LUT based profile types in dispcalGUI, should I use the Lab LUT one? 3) using cLUT profile, do I still need to manually set the black level to see all the shadow details as I've done now for the matrix profile or can I use "native"? 4) are there any other real world advantage/disadvantage for display profile by using the cLUT profile type besides it contains more information and more flexible? thanks! On Sun, Sep 11, 2011 at 4:16 AM, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote: > xun wang wrote: > > I'm not sure if there is a default black point for argyllcms. > > Hi, > > You have read this <http://www.argyllcms.com/doc/CrushedDisplyBlacks.html>, > haven't you ? > > Graeme Gill. > >