[argyllcms] Re: Dispcal - Inverting Jacobian failed?

Gerhard Fuernkranz wrote:

I'm still surprised. Even if the device response is flat in this region,
I guess it still not so likely that this immediately leads to a singular
Jacobian matrix, due to noise in the XYZ readings. 

It depends on the instrument. Some quantize at certain levels,
particularly low levels. It's certainly happened in the past,
hence my gradual conversion of such failures from fatal errors
to recoverable warnings.


Alastair, is this problem reproducible, or sporadic?
Which of the three error messages did you get?

    * "Inverting Jacobian failed (1)" or
    * "Inverting Jacobian failed (2)" or
    * "Inverting Jacobian failed (3)"


It has to be (3), since (1) and (2) are fatal.

cheers,
        Graeme Gill.

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