QTR-Quadtone RIP

I was able to extract data from the quad files to make a qidf file.
Awhile back I uploaded one of the curves into the files section
for the 2200 called k7_test.qidf.
I replicated the HPR curve for the 2200. By using the exact data
I was able to get darn close.
http://home.austin.rr.com/schrochem/Pics/K7_Mycurves.JPG

The bottom one is the one I was able to create.
It wasn't easy either and I never finished that 'project.'
I had setup a MSAccess DB that would count how many
points each shade had that wasn't 0 and then keep the lowest and highest
and then get up to 48 more points that were evenly distributed between
the two. In QTR you can then use the 'load curve' option
and paste the 50 points. Then repeat for the other inks.

I also think it might be a useful tool in tweaking the curves.
You can get the raw data after the normal curve generation
and go back and smooth out areas you want.
I was also hoping to get a feel for how the raw data should
inter-relate with the possibility of maybe working backwards
or as an optimization tool.
BUT I have some ink density, limit concepts to understand first.

Scott

Scott


On 3/13/07, Carl Schofield <list@...> wrote:
>
>   Tom,
>
> If you think it might be useful to others please do put it in the
> files section. I extracted the numbers from a file for the 2400
> printer so I don't think this can be used for other printers. Note
> also that if anyone uses this file they should first delete the
> existing linearization data before using the file with new papers. I
> actually got the idea form a post by Howard Shaw (see his example
> curves here: http://www.howardshaw.org/docs/k7-qtr/k7curves.htm). He
> made a similar profile for the 2200 printer. Roy was also looking
> into a way of automating the curve extraction from the .quad files,
> but I don't know if he has pursued this any further.
>
> Regards,
> Carl
>
>
> 
>


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