QTR-Quadtone RIP

Walker,

I think Roy will have to address that question, but I thought that  
QTR was relying on Photoshop to handle the front end icc conversion.   
I didn't realize that LR was passing the CM buck, but what you say  
certainly helps explain the problem.

Thanks,
Carl

On Jun 30, 2007, at 5:57 PM, Walker Blackwell wrote:

> I believe I just got to the bottom of it. Photoshop (it seems) does
> all of the grunt-work when it comes to pure color management. That's
> because it's been around since before OSs had any color management.
> So when you print a big'ol image it's actually doing a hard-
> conversion of that file to the out-put profile and then sending that
> data along to the print driver. (Thus all the time it takes to
> print.) All the print driver has to do is send the data to the  
> Printer.
>
> Lightroom, on the other hand, tags the image with the profile and
> lets the print driver handle the conversion. I think that is where
> it's getting sticky. This explains why I was having such a hard time
> with the old Spro9600 drivers when printing color. They just couldn't
> handle the profile conversion themselves. The driver expected a
> converted file.]
>
> It also explains the slight lag between finishing a file rip in
> Lightroom and seeing it come up in the print queue.
>
> Can QTR handle ICC profile conversions? And is it v4 compliant? Most
> likely more and more applications will come out soon that will
> require OS and Driver color management instead of doing all the work
> themselves. It makes everything faster and more scaleable.
>
> The nice thing is the Adobe CMM is open source and available to use
> for such a thing as driver-based ICC conversions.
>
> take care, Walker