QTR-Quadtone RIP

All (that I’m aware of) current pt/pd workflows currently require some (curve/level) adjustment in Photoshop (or the like) to correct for basic contrast variables introduced by specific chemistry choices during the printing process after one has figured out the basic contrast ratio issues (dmax/dmin). (I guess you could apply a photoshop curve as linearization data to the bottom of a QTR descriptor? Is that what you are talking about?)

I’m new to this but have been working very hard on some really interesting mathematical algorithms recently re: this very problem. I can’t go into detail but I guess I would say stay tuned. If it works it works.

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There are a few really amazing resources out there. Ron Reeder is one, Mark Nelson another, and Jon Cone’s system (full disclosure I work for/with him now) of course.

Ron’s book on the digital negative and platinum printing is a great read and worth a start. (http://www.ronreeder.com/a-new-book-on-qtr <http://www.ronreeder.com/a-new-book-on-qtr>) Nelson’s curve system is another incredible and in-depth and genius take on it all using color inks mixed with zone-system brain power (http://www.precisiondigitalnegatives.com/ <http://www.precisiondigitalnegatives.com/>) and automated photoshop curves, and Jon’s inks are truly in sync with all of it essentially . . . we are all kinda nuts about this stuff. Dunno if it’s that sane but hey.

regards,
Walker
R&D @ InkjetMall



> On Jan 29, 2016, at 7:03 PM, Roy Harrington roy@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
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> No sure what you want for a "no curve" profile.
> There are several people who do negs and you ought to follow one of their workflows.
> See www.ronreeder.com <http://www.ronreeder.com/> for example.
> 
> Roy
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> On Thu, Jan 28, 2016 at 10:21 PM, kayeffdubphoto@... <mailto:kayeffdubphoto@...> [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com <mailto:QuadtoneRIP@yahoogroups.com>> wrote:
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> I've been struggling to understand how to create an ink descriptor file (profile) for OHP.  I'm making negatives for alt process (pt/pd) printing.  I have samples for a 3880, and I know how to make and measure the linearization curve in photoshop, but I'm stuck on creating the "no curve" profile.  Can anyone point me to one?  Thanks!
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> -- 
> Roy Harrington
> roy@... <mailto:roy@...>
> www.harrington.com <http://www.harrington.com/>
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>