Digital BW, The Print

On Monday, March 17, 2003, at 03:00  PM, Roy Harrington wrote:

Thanks for the suggestions Roy.  I haven't had time to do much
with the black curve tweaking yet, but will work on it later this week.
> Unfortunately, I don't have a 2200 to try things out and know
> the results.  But this does sound somewhat similar to things
> I've seen with quad inks on my 1160.
>
> It seems that the gimp-print calibration is done such that
> there is a linear ink density response up to Density = 1.  But
> that doesn't give the maximum possible dMax.  What I've
> done with the quad curves is to use a Density = 2 and then
> to compensate for a gradual leveling off of the ink density
> response I have quite a steep black curve right at the end.
>
> If you look at my CMK separation curve you'll see what I mean.
>
> So for the 2200 what I would try is to use Density = 2 and
> change the Black curve.  The idea is to go linearly up the ink
> density you got back when you set Density = 1.  Then increase
> the slope ending in the top corner.   Without a densitometer
> reading I don't know where to tell you to put these points but
> these two points in the Black curve should give you the
> general idea.  (I=79%,O=61%) and (I=91%, O=76%)
> I've just made these up but if you put then you  can see there's
> a break in slope between them -- this is where the dMax
> using Density = 1 should be.  Move them up or down to
> match dMax at Density = 1, move them right to increase the
> shadow detail, left to make sure your whole picture doesn't
> get too light.
>
> It's awful hard to say this all clearly so email me if you have
> questions about it.
>
> Roy
>
>
>
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