QTR-Quadtone RIP

Sandy,

Are you loading six cartridges with PK or six different shades of gray?

Thanks

Alan

> On Jan 28, 2015, at 5:12 PM, sanking@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> 
> May I quote a discussion about making negatives, dithering, etc..I had with Roy early last year; he said:
>  "Each ink has a different dithering placement of drops.  So it's best to have both more individual ink and more different inks for more hiding of the drops."
> This is rather comforting about any pattern accentuation, each channel is not supposed to use the same pattern.
> But making the curves "not totally congruent" may be safer anyway.
> Different ink limits for each channel could maybe also help in that direction, and also attenuate the larger dots transition, if some is actually taking place?
> 
> For digital negatives I am almost certain that you want more nozzles shooting out drops. In my experience digital negatives made with only PK definitely print less smooth than negatives made with PK, Y and LLK, and negatives made with six shades of PK print even smoother. 
> 
> I adjusted the K8-12 profile for the 7800 so that there are eight different curves, but total ink is the same,  and printed a step wedge negative on Pictorico, with a continuous tone strip. I examined the this to a previous step wedge and tonal strip printed with a single curve, and see no difference in smoothness, or in transition. I will need to make an actual print in carbon to be certain, but from what I am seeing at this point the negatives are virtually identical.
> 
> For the record, I print digital negatives with the 7800 at 2880 dpi, Uni-Directional, and without advanced dithering options. 
> 
> Just for the record, the profile I am printing is about equal in smoothness to one I previously made with five different shades of gray, with overlapping curves. With the 7800 the smoothness is about what you would get in printing a 4X5 negative at 16X20. With the R3000 there is greater smoothness.
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> Sandy
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