QTR-Quadtone RIP

Of course I should have said how you get from L* 0 - 10 in your on screen
image ...
Robert shadows are low L* values. I am not 100% sure what you mean by "matte
papers in the deep shadows (90-100)"
What does the 90-100 refer to ?

Mike

2009/8/1 Michael King <drmrking@...>

> 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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