*From*: Graeme Gill <graeme@xxxxxxxxxxxxx>*To*: argyllcms@xxxxxxxxxxxxx*Date*: Sun, 06 Sep 2009 07:40:36 +1000

Pascal de Bruijn wrote:

0%colprof: Error - rev: bwd vertex 0 is not prime or secondary

Hmm. I'm not sure if this is a bug or not. It's not really valid to try and invert a monochrome response as if it was color. If the response has some volume you might succeed, but if it has zero volume in some areas you may well get strange numerical errors, much like you discovered. You can at least get a forward profile if you run with the -B flag (this is probably luck though.) cheers, Graeme Gill.

**Follow-Ups**:**[argyllcms] Re: colprof: Error - rev: bwd vertex 0 is not prime or secondary***From:*Pascal de Bruijn

**References**:**[argyllcms] colprof: Error - rev: bwd vertex 0 is not prime or secondary***From:*Pascal de Bruijn

- » [argyllcms] colprof: Error - rev: bwd vertex 0 is not prime or secondary - Rick Richardson
- » [argyllcms] Re: colprof: Error - rev: bwd vertex 0 is not prime or secondary - Graeme Gill
- » [argyllcms] Re: colprof: Error - rev: bwd vertex 0 is not prime or secondary - Rick Richardson
- » [argyllcms] colprof: Error - rev: bwd vertex 0 is not prime or secondary - Pascal de Bruijn
- » [argyllcms] Re: colprof: Error - rev: bwd vertex 0 is not prime or secondary - Graeme Gill
- » [argyllcms] Re: colprof: Error - rev: bwd vertex 0 is not prime or secondary - Pascal de Bruijn
- » [argyllcms] Re: colprof: Error - rev: bwd vertex 0 is not prime or secondary - Graeme Gill