QTR-Quadtone RIP

You know the more I think about this, it seems like maybe the linearization
within QTR is already a kind of perceptual rendering, since it re-maps the
curve to given you a smooth, even transition from black to white (0 to 100).
In that case maybe by converting to the ICC profile with perceptual intent,
in a way you're double-profiling?
 

Jeff
 


  _____  

From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
Behalf Of Roy Harrington
Sent: Thursday, August 24, 2006 11:45 AM
To: QuadtoneRIP@yahoogroups.com
Subject: Re: [QuadtoneRIP] Re: Printing with ICC profiles



Hi Jeff,

If you are seeing a drop in dMax using the ICC profile, the profile 
conversion is probably being
done incorrectly. It sounds like RelCol conversion instead of 
Perceptual.

I can't tell whether you are on a PC or Mac but Photoshop often 
defaults to
Relative Colormetric conversion rather than Perceptual Intent. Be 
sure to double check that you
are using Perceptual and using Black Point Compensation.

Roy

On Wednesday, August 23, 2006, at 11:01 AM, Jeff Kohn wrote:

> From what I'm seeing so far, I think it's best to just use the ICC 
> profiles for soft-proofing and not printing. I'm finding that printing 
> an image using the "QTR Gray Lab" profile yields better results than 
> using a Create-ICC generated profile with perceptual intent. The 
> latter lightens the print noticeably, and really kills the DMAX of the 
> print (dropping it from 1.6 to 1.3 in the case of my custom curve for 
> Hahnemuhle Photo Rag that I'm currently working on).
>  
> I've been meaning to post a discussion about this and will try do so 
> in the next few days. First I want to finish tweaking my custom curve 
> and do a bit more testing/measuring.
>  
> Jeff
>  
>
<image.tiff>
>
> From: QuadtoneRIP@ <mailto:QuadtoneRIP%40yahoogroups.com> yahoogroups.com
[mailto:QuadtoneRIP@ <mailto:QuadtoneRIP%40yahoogroups.com> yahoogroups.com]

> On Behalf Of dlruckus
> Sent: Wednesday, August 23, 2006 12:37 PM
> To: QuadtoneRIP@ <mailto:QuadtoneRIP%40yahoogroups.com> yahoogroups.com
> Subject: [QuadtoneRIP] Re: Printing with ICC profiles
>
>
> Hi Joe.
> You need to convert to profile before printing.
>
> Regards
> Duane
>
> --- In QuadtoneRIP@ <mailto:QuadtoneRIP%40yahoogroups.com>
yahoogroups.com, "joemulligan_68"
> <joemulligan_68@...> wrote:
> >
> > Since the Yahoo search is not the most efficient, I hope to ask this
> basic question:
> >
> > How do you print using icc from QTRgui?
> >
> > I have been successful with the Create ICC program while printing on
> Mac but since I am now
> > running bootcamp and Windows, how do I go about this with QTRgui?
> >
> > Should I Assign Profile to the file and then print? Or should I
> Convert to Profile?
> >
> > A bit confused at the moment. Thanks to all in advance.
> >
> > JoeM
> >
>
> 
-
Roy Harrington
roy@harrington. <mailto:roy%40harrington.com> com
Black & White Photo Gallery
http://www.harringt <http://www.harrington.com> on.com