QTR-Quadtone RIP

That all depends on the embedded profile (or working space if you
don't have one).
The embedded profile tells you what the numbers "mean".  So in gray gamma 2.2
K=50 is L=54, in GG1.8 it would be L=60.   L values are absolute, K is
relative to
a profile.   There's a profile I made called GrayLab where the values
are linear,
so L+K=100.

The way to look at it is: K for grayscale, and R,G,B values for color are the
actual numbers in the file, an embedded profile tells what those numbers are
supposed to mean in luminosity (Lab).

Roy

On 7/16/07, David <dkfreed@...> wrote:
> And one more question: Also, it looks like that Lab numbers don't
> always equate to a 'mirror' of the grayscale percentages, is that
> correct?  For example, it seems that 50% grayscale is 54 Lab and 85%
> grayscale is 13 Lab.
>
> thanks again, David.
>
> --- In QuadtoneRIP@yahoogroups.com, "David" <dkfreed@...> wrote:
> >
> > Thanks Roy.
> >
> > So if I understand you correctly, this curve is "lowering" or
> > lightening the black because the paper won't accept pure black? Is it
> > lightening the black or applying less ink?
> >
> > And when I applied the raw curve (UCmk-raw-neut.qidf) when I
> > printed--which has a blank linearization table--it printed, or tried
> > to print, full black to white?
> >
> > Best, David.
>
>