Originally Posted by gwgill
I've updated http://www.argyllcms.com/Win32_collink_3dlut.zip
with the latest fixes for BT.1886 processing. The black point shouldn't be lifted as much when the display black is not neutral, and the gamma curve is now effective gamma by default, making the reproduction much less dependent on the black point being measured or profiled with perfect accuracy. Note that the syntax has changed if you want to alter the default effective gamma, it now looks like "-I b:2.2". The default effective gamma is 2.2, since this is close to what you get with a power of 2.4 and and some sort of black point offset.
I just noticed that the 5/9/2013 [CRC: 66A544A9] binary which I download yesterday from Doom9 had documentation dated 5/8/2013, which you've now updated to 5/10/2013 docs with the same [CRC: 66A544A9] binary. That collink binary still refers to the -Ib -Ix.x syntax in its printed help, and didn't complain when -Ib -Ix.x syntax was used. The 5/9/2013 [CRC: 66A544A9] binary rejects -IB as well.
It seems you may have included the wrong binary in the zip again?
[Edit 5/10/2013 11:59PM PDT: It seems the Win32_collink_3dlut.zip was just updated to remove the \link\ folder, but the \bin\ folder still has outdated collink.exe supporting only the old syntax.]
[Edit 5/11/2013 12:23AM PDT: Win32_collink_3dlut.zip was updated again and now contains the correct version of collink.exe (5/11/2013 CRC: BE98B91A), supporting the new syntax]
Also I'm a bit unclear about these changes. According to the new docs and your description it would seem:
-IB:x.x (new syntax) == -Ib -Ix.x (old syntax) == dispcal -Gx.x -f0 ???
-Ib:x.x (new syntax) == dispcal -gx.x -f0 ???
As for defaults, without gamma override specified:
-IB (new syntax) == -IB:2.4 (new syntax) == -Ib (old syntax) == -Ib -I2.4 (old syntax) ???
-Ib (new syntax) == -Ib:2.2 (new syntax) ???
Is that correct?