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Trouble shooting

Trouble shooting

2016-03-05 by patrick.t@...

Hello everyone,

I've used qtr with carbon based inks in the past for quite awhile but having some problems now. I had two different Epson 7800's fail on me over the last year and so have had little opportunity to much printing. I finally picked up a third 7800, made new carbon inks based on Paul Roarks recipe, Installed it all, recalibrated my monitor, made new paper profiles using a colormunky and linearization it all, but getting very unsatisfactory results. What comes out of my printer is quite a bit lighter in the mid-tones to the shadows; particularly the shadows ..... not the blackest black per se. Can any one of you out there offer any insite? Could it be that I just goofed up the darker ink dilutions when I originally made them. Anybody got any ideas. I've included a link here that should take you to a page on my site where you can see a visual representation of the difference I'm experiencing. My website is below and you should see the page titled 7800/QTR test in the menu selection on the right side of the screen.

http://patrickturnerphotography.com/

Thanks again for any helpful tips.

Patrick


Re: [QuadtoneRIP] Trouble shooting

2016-03-05 by Keith Schreiber

A couple questions off the top of my head:

1. Are you sure the printer was working properly before you installed the carbon inks?

2. PC or Mac? If Mac, what OS X version, and are you using PrintTool?

There are others who I’m sure can be of more help than I, but your answers to these questions will be useful.

~ Keith

Keith Schreiber
jkschreiber.com
Show quoted textHide quoted text
> On Mar 5, 2016, at 1:00 PM, patrick.t@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> Hello everyone,
> 
> I've used  qtr with carbon based inks in the past for quite awhile but having some problems now. I had two different Epson 7800's fail on me over the last year and so have had little opportunity to much printing. I finally picked up a third 7800, made new carbon inks based on Paul Roarks recipe, Installed it all, recalibrated my monitor, made new paper profiles using a colormunky and linearization it all, but getting very unsatisfactory results. What comes out of my printer is quite a bit lighter in the mid-tones to the shadows; particularly the shadows ..... not the blackest black per se. Can any one of you out there offer any insite? Could it be that I just goofed up the darker ink dilutions when I originally made them. Anybody got any ideas. I've included a link here that should take you to a page on my site where you can see a visual representation of the difference I'm experiencing. My website is below and you should see the page titled 7800/QTR test in the menu selection on the right side of the screen.
> 
> http://patrickturnerphotography.com/ <http://patrickturnerphotography.com/>
> 
> Thanks again for any helpful tips.
> 
> Patrick
> 
> 
> 
> 
>

Re: [QuadtoneRIP] Trouble shooting

2016-03-05 by Paul Roark

For Windows, see pages 10 - 11 of
http://www.paulroark.com/BW-Info/7800-Carbon-Variable-Tone-2015.pdf .
Note the difference in the curve for QTR v. Gray Gamma 2.2. The monitor may be displaying the image using the Gray Gamma 2.2 profile (same gamma as Adobe RGB) while QTR prints a straight line response. The print will look lighter, particularly in the shadows.

The workflow does depend on the platform.

Paul
www.PaulRoark.com


Show quoted textHide quoted text
On Sat, Mar 5, 2016 at 12:20 PM, Keith Schreiber keith@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:

A couple questions off the top of my head:

1. Are you sure the printer was working properly before you installed the carbon inks?

2. PC or Mac? If Mac, what OS X version, and are you using PrintTool?

There are others who I’m sure can be of more help than I, but your answers to these questions will be useful.

~ Keith

Keith Schreiber




On Mar 5, 2016, at 1:00 PM, patrick.t@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:

Hello everyone,

I've used qtr with carbon based inks in the past for quite awhile but having some problems now. I had two different Epson 7800's fail on me over the last year and so have had little opportunity to much printing. I finally picked up a third 7800, made new carbon inks based on Paul Roarks recipe, Installed it all, recalibrated my monitor, made new paper profiles using a colormunky and linearization it all, but getting very unsatisfactory results. What comes out of my printer is quite a bit lighter in the mid-tones to the shadows; particularly the shadows ..... not the blackest black per se. Can any one of you out there offer any insite? Could it be that I just goofed up the darker ink dilutions when I originally made them. Anybody got any ideas. I've included a link here that should take you to a page on my site where you can see a visual representation of the difference I'm experiencing. My website is below and you should see the page titled 7800/QTR test in the menu selection on the right side of the screen.

http://patrickturnerphotography.com/

Thanks again for any helpful tips.

Patrick





Re: Trouble shooting

2016-03-05 by patrick.t@...

Yes, I'm pretty sure the printer was fine when I purchased it. I saw a recent pattern check and it all looked good. I work on a Mac (OS El Capitan 10.11) and do use PrintTool for printing.

Thanks for the response.

Patrick
http://patrickturnerphotography.com/

Re: Trouble shooting

2016-03-05 by patrick.t@...

Hey Paul,

I applied the curve and it did take me maybe half the way there. Do you think I have to just experiment with that curve until I get something satisfactory or could something else be the problem. I just ever remember having to do something like this before. I'd often dupliacate the image in PS and then after applying the soft proofing profile of QTR - Matte to the original, I would then apply a curve layer on top and make whatever adjustments I needed to try and match the look of the un-softproofed copy. Does that make sense?

Patrick

Re: Trouble shooting

2016-03-06 by richard@...

Can you post the densities from the 21-step target you measured for doing the linearization step? And then include the measurements after linearizing?

Also, did you just linearize an existing profile that Paul had posted or did you build it from the ground up? If there is any suspicion that the inks might have been mid diluted then you could print the ink separation page and observe the different density graphs for each channel.

Richard Boutwell

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