QTR-Quadtone RIP

Hi,

Trying to make a profile for an Epson 3880 and alas I do not have a densitometer or spectrophotometer to help in the task. So I was pleased to discover the stepwedge tool for using a scanner to measure densities because a scanner is what I do have.

I've been reading everything and slowly coming to understand everything, and I think I'm doing everything right. Even got one of the suggested Tiffen 21 step scales. Though I have to admit, everything is a lot, especially considering I'm not the most technical of people, and it's likely I've made a wrong turn some where.

Anyways, when I run the stepwedge script in Photoshop it explodes in all sorts of ways. I've run it in CS3, CS4 and CS5 all with similar results - though the numbers the script tallies up are always different. I've made some screenshots and it's probably easiest to just go look.

http://consumptive.org/qtrstepwedge.html

The first image is a jpg of the Tiff file from my scanner of the Tiffen stepwedge and my stepwedge print from QTR and the 3880 on the paper I'm attempting to profile. The second image is an example of what happens after selecting the the Tiffen stepwedge and running the script. The final image is an example of then selecting the stepwedge from the 3880 and running the script a second time.

Any ideas what I've done wrong? I'm hoping to make this work as the scanner is my best way of making the profile measurements. Thanks for your time and thoughts.

- James

You need to have the image horizontal.  Just rotate in photoshop.

In general I'd recommend using existing curves as is.  They are
already quite good
and will give excellent results with lots of papers.  Just pick a similar paper.
Of course comparing both ways is a good thing too.

Roy

On Wed, Jul 11, 2012 at 10:25 AM, consumptive_org <consumptive@...> wrote:
> Hi,
>
> Trying to make a profile for an Epson 3880 and alas I do not have a densitometer or spectrophotometer to help in the task. So I was pleased to discover the stepwedge tool for using a scanner to measure densities because a scanner is what I do have.
>
> I've been reading everything and slowly coming to understand everything, and I think I'm doing everything right. Even got one of the suggested Tiffen 21 step scales. Though I have to admit, everything is a lot, especially considering I'm not the most technical of people, and it's likely I've made a wrong turn some where.
>
> Anyways, when I run the stepwedge script in Photoshop it explodes in all sorts of ways. I've run it in CS3, CS4 and CS5 all with similar results - though the numbers the script tallies up are always different. I've made some screenshots and it's probably easiest to just go look.
>
> http://consumptive.org/qtrstepwedge.html
>
> The first image is a jpg of the Tiff file from my scanner of the Tiffen stepwedge and my stepwedge print from QTR and the 3880 on the paper I'm attempting to profile. The second image is an example of what happens after selecting the the Tiffen stepwedge and running the script. The final image is an example of then selecting the stepwedge from the 3880 and running the script a second time.
>
> Any ideas what I've done wrong? I'm hoping to make this work as the scanner is my best way of making the profile measurements. Thanks for your time and thoughts.
>
> - James
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>



-- 
Roy Harrington
roy@...
www.harrington.com

Oh that is too funny. I've been banging my head on this for like a week trying to make it work when in fact I literally did take a wrong turn. Or rather just needed to make a turn. Thank you. I just rotated the file 90 dedrees and ran it again and it works like a charm. Thank you. Thank you.

I'm an old school darkroom guy and have always been dissatisfied with inkjet prints until my recent discovery of QTR. I've no doubt the existing curves work great, just I'm always gonna be wondering. Maybe just too many years mixing up my own chemistry!


--- In QuadtoneRIP@yahoogroups.com, Roy Harrington <roy@...> wrote:

>
> You need to have the image horizontal.  Just rotate in photoshop.
> 
> In general I'd recommend using existing curves as is.  They are
> already quite good
> and will give excellent results with lots of papers.  Just pick a similar paper.
> Of course comparing both ways is a good thing too.
> 
> Roy
> 
> On Wed, Jul 11, 2012 at 10:25 AM, consumptive_org <consumptive@...> wrote:
> > Hi,
> >
> > Trying to make a profile for an Epson 3880 and alas I do not have a densitometer or spectrophotometer to help in the task. So I was pleased to discover the stepwedge tool for using a scanner to measure densities because a scanner is what I do have.
> >
> > I've been reading everything and slowly coming to understand everything, and I think I'm doing everything right. Even got one of the suggested Tiffen 21 step scales. Though I have to admit, everything is a lot, especially considering I'm not the most technical of people, and it's likely I've made a wrong turn some where.
> >
> > Anyways, when I run the stepwedge script in Photoshop it explodes in all sorts of ways. I've run it in CS3, CS4 and CS5 all with similar results - though the numbers the script tallies up are always different. I've made some screenshots and it's probably easiest to just go look.
> >
> > http://consumptive.org/qtrstepwedge.html
> >
> > The first image is a jpg of the Tiff file from my scanner of the Tiffen stepwedge and my stepwedge print from QTR and the 3880 on the paper I'm attempting to profile. The second image is an example of what happens after selecting the the Tiffen stepwedge and running the script. The final image is an example of then selecting the stepwedge from the 3880 and running the script a second time.
> >
> > Any ideas what I've done wrong? I'm hoping to make this work as the scanner is my best way of making the profile measurements. Thanks for your time and thoughts.
> >
> > - James
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> 
> 
> 
> -- 
> Roy Harrington
> roy@...
> www.harrington.com
>