QTR-Quadtone RIP

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


On Wed, Oct 15, 2008 at 9:32 AM, grayscale2008 <pm2003@...> wrote:
> Hi Joost!
>
> Thanks for your answer...
>
> Is there perhaps somebody who can answer my question 2???
>
> Or where can I find some more docu about creating curves?
>
> CU
>
> Peter
>
>
> --- In QuadtoneRIP@yahoogroups.com, "Joost Horsten" <j.h.j.h@...> wrote:
>>
>> --- In QuadtoneRIP@yahoogroups.com, "grayscale2008" <pm2003@>
>> wrote:
>> >
>> > Hi guys!
>> >
>> > I am new to QTR
>>
>> Welcome!
>>
>> > and I am trying do create some curves for my EPSON
>> > 2100 using Hahnemühle Photo Rag with the original UltraChrome ink.
>>
>> Frankly, I thought these curves were already shipped with QTR but I
>> checked and indeed they're not. You may try the the Epson Enhanced
>> Matte curves though as EEM is rather similar to Photorag.
>>
>> > Here are my questions:
>> >
>> > 1.) I want to linearize my curves now. Which file for measuring
>> should
>> > I use?
>> >
>> > There is a "21step.tif" in the "QTR"-directory and there are several
>> > Step-21*.tif files in the "Eye-One"-directory.
>>
>> From a fundamental point there's no difference. It depends how you
>> want to proceed. This is how it is with an Eye-one and Measuretools
>> download from the Gretag-MacBeth website (URL is in the QTR doc):
>>
>> The "21step.tif" and the "step21-gray" are both single sequential
>> stepwedges. I always use a modified version of the 21step.tif as I
>> can easier align me Eye-one on it. But then I tell Measuretools I'm
>> using step21-gray.
>>
>> Step-21-random is meant for a line scanning mode in Measuretools.
>> Instead of measuring the 21 areas one by one it should be possible to
>> have one single movement over the step wedge. Measuretools in then to
>> detect the transitions between the areas. Therefor neigbhoring areas
>> must have sufficient contrast, not true for the sequential step
>> wedge. However, I've never been able to get this feature to work
>> well. So I just have a manual process. So  use the sequential one.
>>
>> The setp-21x4-random allows for four measurements thus averaging out
>> noise.
>>
>> As matter of fact, I do have made a sequential QTR-21x4-gray.txt file
>> (the input files that measure tools reads) to allow for the averaging
>> over four measurements using the sequential stepwegde.
>>
>> So all and all, it's 1) mostly personal preference 2) depending if
>> you want to add accuracty by averaging out some noise.
>>
>> > 2.) Which file should I use to create a icc profile?
>> >
>> > There are 3 exe-files in the "Eye-One"-directory:
>> >
>> > QTR-Create-ICC.exe
>> > QTR-Create-ICC-RGB.exe
>> > QTR-Create-ICC-RGB-bpc.exe.
>>
>> I'm afraid I can't help you on this one as I don't use them
>>
>
>
>
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