QTR-Quadtone RIP

Colin,
 
> ...
>If I take the QIDF file, strip it of the linearized 
>points in notepad 

Why are you working in Notepad?  In the Curve Creator all you need to do is
go to the Linearization tab and hit the Clear button at the bottom.  You
never really need to use Notepad or worry about the *.quad files, which are
stored in the \QuadTone folder.

>... If I then press the show curve button and save it, no quad file 
>of the same name is produced.

Be sure you're saving the file to the right folder -- R1800-3mk.  If so,
there should be a quad file produced in the similar QuadTone folder.  If the
profile shows up in the Curves list on the main GUI, a quad file was
produced.

>I need a QUAD file for Curve 1 in Curve Setup.

Yes.

>I have tied various QUAD files as models, ...

Just ignore them and work with the *.qidf files that you've opened in the
Curve Creator.  The program will take care of the *.quad files.

>I ... investigated the MK-Start QUAD file, copied it, 
>renamed it to be the same as the first part of the QIDF file. ...

Do essentially this same thing, but with the Curve Creator and the Start
file it opens.  Don't use Notepad or mess directly with the *.quad files.  

When you re-name and save the *.qidf file, BE SURE it's in the right folder.
That is a mistake I've made and missed occasionally, which then causes the
profile I think I just made to not show up on the list in the main GUI --
because I forgot to check the folder I was saving to.  Just because you open
a file from the 1800-3mk doesn't mean this program will save to that folder.
It tends to save to the 1800 folder instead.  So, you have to be real
careful to be sure you're saving to the right folder.  

Paul
www.PaulRoark.com