QTR-Quadtone RIP

Hello Mike,

I am also using the Epson 2880 and I am pleased with the results.
Up to now I printed mostly wih the ABW mode. Now I want to move into printing with QTR.

As I am new to QTR I ask you for your experience. Did you create specific curves that are not included in QTR? Coming from Germany I mostly use Hahnemuehle papers like Photo Rag, Bamboo and Baryta.

Best regards
Matthias

-----Ursprüngliche Nachricht-----
Von: Michael King  
Gesendet: 30.03.2010 10:27:09
An: QuadtoneRIP@yahoogroups.com
Betreff: Re: [QuadtoneRIP] Re: New Release of QuadToneRIP 2.7.0 for both Mac  and PC

>I am using 2880 and only 2880. Why use anything else :)
>Mike
>
>On 30 March 2010 06:36, tboleyyh   wrote:
>
>>
>>
>> StudioPrint uses rather severe partitioning, and successfully linearizes 6
>> and 7 inks. Of course it costs much much more. My only point is that lots of
>> overlap is not necessary for this, it can be done, and the number of inks is
>> not the problem.
>> Also, many of us prefer not to lessen the number of grays, as we don't find
>> 3 Ks adequate for our particular needs. If you do, kudos, but one of QTR's
>> great benefits is it's flexibility as a monochrome driver for all kinds of
>> demanding setups for a variety of needs.
>> Mike, are you at 1440 or 1880? Variable dot in every, of many, grays
>> (1440x720) can be very difficult, even only 3. In many of these setups it
>> works because of heavy light ink limiting, which is likely primarily small
>> dots...
>> Tyler
>>
>>
>> --- In QuadtoneRIP@yahoogroups.com ,
>> "shileshjani"  wrote:
>> >
>> > Mike,
>> >
>> > I must say I have never ecountered posterization issues with customary
>> inks that use K, LK, and LLK alone, or as backbone followed by LM, LC, and
>> others for toning via use of "toner" or "copy curve from" in QTR ink setup.
>> >
>> > I think Cone type overlap may (perhaps) be required when using 4+ gray
>> inks, which in my opinion is at best an overkill, and technical mas@#$%^tion
>> at worst. I have not seen a print that was better simply because it had 6 or
>> 7 shades of gray. Try to reduce the number of gray inks in your set up, and
>> use standard QTR curves design tools. I am curious what your eyes will see.
>> >
>> > Shilesh
>> >
>> > Shilesh
>> >
>> > --- In QuadtoneRIP@yahoogroups.com ,
>> Michael King   wrote:
>> > >
>> > > Roy,
>> > >
>> > > >>If you have posterization issues it's almost certainly due to other
>> > > issues.
>> > > More bits and more overlap are pretty much the very last things to be
>> > > concerned about. Posterization is usually in the image or you have bad
>> inks
>> > >
>> > > So all I can say is that I have a image that posterizes with QTR curves
>> > > (limited overlap) but not Cone style overlapping curves. Same inks,
>> same
>> > > printer. Solved the problem by using using overlapping curves and
>> > > linearizing with my own spreadsheet based linearization tool. This 7
>> ink set
>> > > up is using a mix of HP-PK and Eboni MK (18% & 100%). It may have been
>> > > caused by some other effect that I removed by using overlapping curves,
>> but
>> > > there is no doubt that overlapping curves solved the problem, whatever
>> is
>> > > causing it.
>> > >
>> > > Mike
>> > >
>> > >
>> > >
>> > >
>> > > On 29 March 2010 19:00, Roy Harrington   wrote:
>> > >
>> > > >
>> > > >
>> > > > On Mon, Mar 29, 2010 at 9:02 AM, Michael King  > 40gmail.com>>
>> > > > wrote:
>> > > > >>>Is there any benefit in re-creating custom curves for this new
>> version?
>> > > > I
>> > > > > have just finished profiling two papers for QTR and wonder if they
>> would
>> > > > be
>> > > > > a) compatible, b) have greater accuracy with this new version?
>> > > > >
>> > > > > As I read in Roy's answer to my earlier question - there has been
>> no
>> > > > change
>> > > > > to profiling. Its still 8 bit based. BUT he is interpolating
>> between the
>> > > > 8
>> > > > > bit values to generate intermediate values to support 16bit.
>> > > >
>> > > > There have always been 256 points in the QTR curves but the values at
>> each
>> > > > of the points have always been 16-bit. The 256 points are already way
>> > > > overkill
>> > > > compared to, for instance, color ICC profiles. ICC color management
>> > > > typically
>> > > > uses interpolation with just 25 points so QTR curves have 10 times
>> that.
>> > > > Interpolation is a perfectly good technique.
>> > > >
>> > > >
>> > > > >
>> > > > > To be honest paper coatings are barely consistent enough across the
>> page
>> > > > to
>> > > > > let you profile at 7 bits (128 values) never mind more than 8 bits.
>> So we
>> > > > > would be able to gain nothing from Roy directly increasing the
>> curve
>> > > > > resolution beyond 8 bits.
>> > > > >
>> > > > > You might ask what's the benefit of 16 bit printing ? Well I expect
>> the
>> > > > main
>> > > > > benefit is in helping smooth tonal areas avoid posterization, by
>> creating
>> > > > > more ink values in the tonal graduation.
>> > > >
>> > > > If you have posterization issues it's almost certainly due to other
>> issues.
>> > > > More bits and more overlap are pretty much the very last things to be
>> > > > concerned about. Posterization is usually in the image or you have
>> bad
>> > > > inks.
>> > > >
>> > > > Roy
>> > > >
>> > > >
>> > > > >
>> > > > > I've been wrestling with this issue for the last few months and
>> have been
>> > > > > experimenting with Cone style overlapping curves and QTR less
>> overlapping
>> > > > > style. There is no doubt more overlap reduces the problem BUT also
>> for
>> > > > some
>> > > > > papers overlapping curves reduces dmax. So as usual there is no
>> free
>> > > > lunch.
>> > > > > I am excited about the potential of 16 bit printing to address this
>> issue
>> > > > -
>> > > > > just got to Hackintosh my PC first :)
>> > > > >
>> > > > > Mike
>> > > > >
>> > > >
>> > > >
>> > > >
>> > >
>> > >
>> > > [Non-text portions of this message have been removed]
>> > >
>> >
>>
>>  
>>
>
>
>[Non-text portions of this message have been removed]
>
>
>
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