QTR-Quadtone RIP

Hi Joost,

Actually its just the generic ones provided that don't have a simulate
paper white.  Since I didn't have a particular paper in mind I didn't put a
white end in the profile.

The custom ones though all do have that capability.  You can easily
create your own MattePaper profile using data such as:

Gray Lab A B
0    96  0 0
100  16 0 0

Fill in your Lab A & B values if you like.  Even if you don't have real
measurements, experiment with some numbers for best match.

Roy


On Fri, Oct 17, 2008 at 1:51 PM, Joost Horsten <j.h.j.h@...> wrote:
> Roy,
>
> Thanks, that's also relevant info for me. Frankly, while really
> appreciating the curve creation and print driver site of QTR I have
> never come to grips with wrt the softproofing side. One of the key
> things that's puzzling me is why it apparently optional for icc
> profiles to support the functions "simulate paper color"
> and "simulate black ink" (I'm using Photoshop CS3 on Windows Vista)
> The icc profiles provided with QTR (gray-lab, gray-matte etc.) DO
> support "simulate black ink", but not "simulate paper color". Other
> profiles that do support "simulate paper color" tend to darken the
> image (substantiall), which I find logical as light reflected on
> paper is of a lower luminosity then white emitted from a monitor. And
> that is what still bothers me most in getting a better monitor-print
> match (QTR curves are fine, monitor is calibrated).
>
> Can you shed some light on this? Is my expectation/wish correct or am
> I missing the point? What is the reason that the QTR icc profiles do
> not support this option?
>
> Thanks,
>
> Joost
>
>
>
>
>
> --- In QuadtoneRIP@yahoogroups.com, "Roy Harrington" <roy@...> wrote:
>>
>> Hi Peter,
>>
>> There are 3 create icc programs because some editing programs have
>> restrictions and anomolies.
>>
>> QTR-Create-ICC makes a grayscale ICC for printing and softproofing.
>> Photoshop handles these and works great.
>>
>> QTR-Create-ICC-RGB makes a functionally identical ICC but it's in
> RGB format.
>> Programs such as Lightroom, Qimage, and I think others don't work in
>> grayscale so you need an RGB format ICC file.
>>
>> QTR-Create-ICC-RGB-bpc is similar to the above but maps black-to-
> black
>> directly.  This takes away softproofing with simulate-ink-black
> capability.
>> But some programs seem to get the "Black Point Compensation" wrong
> with
>> the above ICC profiles so this ensures that everything is correct.
>>
>> It's unfortunate that there seems to be variation of how different
> programs
>> handle B&W issue but that is the current state of things -- so
> different ICCs
>> are needed for them.
>>
>> Roy
>>
>>
>
>
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