Digital BW, The Print

In the QTR print dialog the top pull down has QTR 8-bit, QTR 16-bit, and Calib Mode.

You also need to make sure the program you are printing from sends 16-bit.
In Photoshop CS5 there's a Send 16-bit Data on the preview page.   In CS4 its
hidden under Color Management pulldown:  select Output and see a 16-bit checkbox.
To set these the file has to be 16-bit and you have to have a QTR printer selected.
LR 3 has a 16-bit output in the Print section.  I'm not sure about Aperture.   All
other standard Mac apps don't send 16-bit as far as I know.

You need to be careful that you make all these selections to ensure real 16-bit.
Do all 16 or all 8 -- don't mix. 

Roy

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "hflockwood" <hflockwood@...> wrote:
>
> 
> 
> Very BIG SNIP, small question:
> 
> 
> > To answer your question about how QTR works.  On the Mac if you send QTR the
> > 16-bit data (check 16-bit in PS and in QTR), QTR will linearly interpolate the
> > values from the .quad file between 128 and 129.  On PCs or Mac where you don't
> > set 16-bit, it'll work like the second case above.  Note that the 16 to 8 bit
> > conversion has to be done intelligently -- PS and QTR both do this.
> > 
> > Try this out.  It's really worth seeing for yourself.
> >  
> > Roy
> 
> Roy,
> 
> On a Mac, how does one choose 16 bit in QTR?
> 
> Harry
>