QTR-Quadtone RIP

Thanks so much--that was exactly the issue: A change in the RGB space from Adobe to ProPhoto.  

With this new information, a related issue comes to mind, that of the use of the QTR gray lab working space, which as far as my empirical testing indicates is essentially the same as the untagged space, but with a name.  Is there an advantage to converting untagged docs into this space before printing?
thanks,
byron

--- In QuadtoneRIP@yahoogroups.com, Roy Harrington <roy@...> wrote:
>
> Hi Byron,
> 
> The eyedropper in Photoshop can be confusing.  There's a lot going on
> behind the scenes with it.
> When you look at the values that correspond to the file type its very
> simple -- you see what's in the
> file.  In other words RGB eyedropper with RGB file you see the exact
> values, Gray eyedropper with
> grayscale file you see 8 bit values as percents. (this is a simple
> calculation (255-0) --> (0-100)).
> 
> But when you look at RGB eyedropper with grayscale file the conversion
> is done using color management.
> With an untagged file the Color Settings...  selections dictate how
> the conversion is done.  In your
> case the file will be treated as having the Gray Working Space and be
> converted to the RGB Working
> Space in order to show you the values in the eyedropper.   So what has
> happened is that you've
> changed either or both of the working spaces in Color Settings.
> 
> So the target file is just fine.  Whether or not you get identical
> results compared to before depends
> on the exact workflow and if it contains some color management
> conversions.  The best thing to do
> is try things out and see the actual results.  Going into Color
> Settings and figuring out what your
> old settings might be is probably not too hard either.
> 
> Roy
> 
> On Mon, Dec 6, 2010 at 8:03 AM, Byron <byronsky@...> wrote:
> > Thanks much for the grayed out custom sizes fix!  My latest issue is with rgb values no longer corresponding with percentages as they used to (in the same color space).  Last week the 21-step greyscale linearization downloaded and opened in an 8-bit untagged gray space with 100%=RGB 0, 95=17, 90=28, 85=37, etc. Today, having finally resolved the custom paper size issue, the print values are wrong. 100% is still RGB 0, but 95 is now 14, 90 is 21, 85 is 28, 80 is 36, etc...all with same document profiles, archives, version of photoshop (CS4).  As I use these for negatives, densities change, and everything will need  recalibration if I can´t get back where I was.  Or what obvious error am I overlooking?  Much thanks,
> > byron
> >
> >
> >
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