[argyllcms] Black point powell failed

Hi,

im having a problem with profile. Depending on the
measuredata profile fails with
"./profile: Error - set_icxLuLut: Black point powell failed"
in xlut.c line 3563.
I tried to debug the problem but failed to understand the
code. The function powell returns -0.95.

This happens on a Canon W8400 that can produce extremely
dark black. With 100% black ink only i get a Lab Value of
2.297 3.558 -3.788 and with mixed CMYK black (all inks at
100%) its possible to get a Lab of  0.474 0.012 -0.059.

Maybe this has something to do with it.

Any ideas?

Stefan

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