QTR-Quadtone RIP

Robert,

Here are the L* readings I measured some time ago with HPR+K7 on the R1900
for RGB 0 - 27
It turned out it wasn't a particularily good batch of HPR I chose to measure
with 256 steps.
often I can get down to L* 16.x

    RGB, L* 0 17.75519 3 18.5508 6 19.38313 9 20.26813 12 21.233 15 22.31181
18 23.18398 21 23.84067 24 24.91842 27 25.61255

So as you can see K7 puts out good seperation between low RBG values. In
fact its pretty much linear across RGB 0 - 255 range. How you get from L* 90
- 100 in your on screen image to something on your printer that shows
seperation in those values is a workflow/profiling issue not a K7 issue.

Mike


2009/8/1 robert49brake <robert49brake@...>

>
>
> Just out of curiosity. Can anyone tell me what kind of separation they are
> getting on any matte papers in the deep shadows (90-100) with K7 and QTR.
> I'd especially like to hear from R1800 users if there are any. Also, are you
> getting any artifacts as you transition into the darkest ink? Nothing
> negative to do with K7, I'm wondering if Jon Cone has a solution I'm missing
> in my non-Piezography inksets.
>
> 
>


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