QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, Richard Smallfield <r.smallfield@...> wrote:
>
> At 12:56 PM Monday 6/5/2006, you wrote:
> >No, never convert a profiling chart before printing it...
> 
> I'm learning all this stuff too and just made my first icc profile today from Paul Roark's 
article on doing it with a scanner.
> 
> I used his 21-step test strip and not Roy's one that came with QTR - does that matter?

It depends on a couple of things, can you direct us to the article?
Assuming this is a "normal" aproach to profiling, what matters is that the numeric values 
of the 21 step chart exactly match those in the reference file used for comparison when 
building the profile.

> Also I converted the test strip to Grey-Lab.
> 
> Do I have to do it again?

As you might be able to tell from above, if you've converted the chart before printing, the 
numbers sent to the printer will no longer match the reference, therefore the resulting 
profile will be incorrect.
Again, I'm making assumptions about the procedure and need to see it before answering.

> 
> Sorry if these are dumb questions,...

well. the inevitable "it depends" answer get's pretty dumb sometimes too...
Frankly, when it comes to using Roy's software for profiling, I wouldn't trust any procedure 
but his if you are not experienced with this stuff. As you can tell by now, there is a LOT of 
confusion and bad info out there about color management and I know Roy is on top of it.
Tyler