Digital BW, The Print

On 12-05-31 4:57 AM, "wolverinemsu" <bchug@...> wrote:

> Sometimes when using the Munki, a
> patch or two are not measured "correctly" in that the "L" values don't follow
> the rest of the curve.  This is especially noticable in the darkest patches,
> where the values may actually reverse (darker patches give higher "L" values.
> I export the L*a*b values from the scanned palette and import them into Excel,
> where I can plot them ("L" vs. % black).  It becomes very apparent which
> patches fall off the curve.  I remove (delete) the offending point(s) then use
> a 6th order polynomial trendline to generate a smooth curve and use the
> coefficients to generate a smooth set of points.  These are then copied into
> the "L" values in the text file used to drop into the QTR-linearize droplet.
> The resultant linearization values, when copied into the QTR ink descriptor,
> give a nice smooth curve.

This looks interesting wolverinemsu.

A question. How do you know that those particular patches have been measured
incorrectly, as opposed to being a legitimate product of QTR, your ink set
and the paper you're using?

Terry.