[argyllcms] Re: Colprof feature request: amount of blackpointhuecorrection control

Nikolay Pokhilchenko wrote:
> Gerhard Fürnkranz wrote:
>> You're right, but I still find it interesting that nearest distance
>> clipping of "absolute black" in CIELAB versus CIECAM space makes so
>> much difference for this particular printer profile.
>
> No, Gerhard, it's obvious if You'll take a look at profile gamut in both 
> spaces. Try this:

Nikolay, what I actually wanted to say is that I find it interesting
that devices/profiles with the observed behavior actually exist in real
life. I don't doubt the existence of a point on the gamut hull which is
(just a little bit) closer to [0,0,0] in Jab space than the device BP
[though this is IMO not so obviously visible in the wrl; visually I
could only see some evidence when using high resolution for the wrl, and
looking very closely, from different angles].

-Gerhard

> iccgamut -ir -pl LSM2484.icm
> rename LSM2484.gam LSM2484-pl.gam
> iccgamut -ir -pj LSM2484.icm
> rename LSM2484.gam LSM2484-pj.gam
> viewgam -cr -s -t0.5 LSM2484-pl.gam -cg -w -t0 LSM2484-pj.gam LAB_Jab.wrl
> then see resulting Lab_Jab.wrl by VRML-viewer.
>
> You'll see, that nearest to absolutely black point of Lab gamut will be at 
> R=G=B=0, but nearest to true black Jab gamut point isn't RGB zero (for higher 
> precision use -d4 or even -d3 key for iccgamut if  possible).

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