QTR-Quadtone RIP

I've been trying to create a set of curves for a new paper on my Epson 3880, but the initial curve never becomes a straight line after linearization. Isn't it supposed to become a straight line?

I read all the docs and did the following: printed the ink separation chart and calculated my ink limits for K, LK, and LLK inks. (The numbers were K: 55%, LK: 46%, LLK: 14%.) After inserting those numbers into my new curve file and installing the file, I printed the Step-21x4-random.tif file and used my Datacolor 1005 spectrophotometer and Spyder3Print software on a Mac to read the swatches. After running the resulting file through QTR-Linearize-Data, the result came out as a curve.

Step	Dens	Lab	A	B	
0.00	0.045	96.09	0.00	0.00	-                             b                          L  +
5.00	0.075	93.51	0.00	0.00	-                             b                         L   +
10.00	0.100	91.44	0.00	0.00	-                             b                       L     +
15.00	0.125	89.39	0.00	0.00	-                             b                      L      +
20.00	0.155	86.99	0.00	0.00	-                             b                     L       +
25.00	0.188	84.45	0.00	0.00	-                             b                   L         +
30.00	0.225	81.61	0.00	0.00	-                             b                 L           +
35.00	0.280	77.57	0.00	0.00	-                             b               L             +
40.00	0.318	74.92	0.00	0.00	-                             b             L               +
45.00	0.363	71.82	0.00	0.00	-                             b            L                +
50.00	0.415	68.36	0.00	0.00	-                             b          L                  +
55.00	0.477	64.41	0.00	0.00	-                             b       L                     +
60.00	0.542	60.49	0.00	0.00	-                             b     L                       +
65.00	0.615	56.36	0.00	0.00	-                             b  L                          +
70.00	0.688	52.44	0.00	0.00	-                             bL                            +
75.00	0.782	47.63	0.00	0.00	-                           L b                             +
80.00	0.877	43.15	0.00	0.00	-                        L    b                             +
85.00	1.047	35.92	0.00	0.00	-                    L        b                             +
90.00	1.282	27.35	0.00	0.00	-               L             b                             +
95.00	1.675	16.14	0.00	0.00	-        L                    b                             +
100.00	2.138	6.60	0.00	0.00	-  L                          b                             +

LINEARIZE="96.085 93.5125 91.435 89.3875 86.9875 84.455 81.6075 77.57 74.915 71.8225 68.355 64.405 60.4925 56.3575 52.4375 47.6275 43.1525 35.9175 27.3475 16.14 6.5975"

Is this the way it should be? Did I do something wrong? Am I mis-interrpeting the word "linearize" here?

Any help/explanation would be greatly appreciated.

Many thanks,
Dave

Not sure how far you've gone but just to be sure, have you added the 
Linearize data generated to the qidf file and regenerated the quad file? 
(Not using a Mac, I don't know how you do this on that platform)

On 15/03/2011 18:04, dkosiur wrote:
> I've been trying to create a set of curves for a new paper on my Epson
> 3880, but the initial curve never becomes a straight line after
> linearization. Isn't it supposed to become a straight line?
>
> I read all the docs and did the following: printed the ink separation
> chart and calculated my ink limits for K, LK, and LLK inks. (The numbers
> were K: 55%, LK: 46%, LLK: 14%.) After inserting those numbers into my
> new curve file and installing the file, I printed the
> Step-21x4-random.tif file and used my Datacolor 1005 spectrophotometer
> and Spyder3Print software on a Mac to read the swatches. After running
> the resulting file through QTR-Linearize-Data, the result came out as a
> curve.
>
> ...
>
> LINEARIZE="96.085 93.5125 91.435 89.3875 86.9875 84.455 81.6075 77.57
> 74.915 71.8225 68.355 64.405 60.4925 56.3575 52.4375 47.6275 43.1525
> 35.9175 27.3475 16.14 6.5975"
>
> Is this the way it should be? Did I do something wrong? Am I
> mis-interrpeting the word "linearize" here?
>
> Any help/explanation would be greatly appreciated.
>
> Many thanks,
> Dave
>
>

-- 
mike finley photography
fine art photography and website construction
http://mypicks.efikim.co.uk
http://www.mikefinley.co.uk
http://www.roguegenecollective.com/Mike_Finley.html
http://www.efikim.co.uk

>>Not sure how far you've gone but just to be sure, have you added the
>>Linearize data generated to the qidf file and regenerated the quad file?

and then print the target with that new .quad file that includes
linearization data?

Also you need to be 100% sure that you are printing without icc profile to
create profile. Easy to do in QTR on Windows (its a standalone app) but on
the Mac its not a standalone app so not sure how you print without profile.

Then when you print the target you need to again to consider whether you are
printing with or without icc profile. A target with gamma 2.2 profile will
give you a gamma 2.2 curve :)

Mike

On 15 March 2011 18:52, Mike Finley <mike@...> wrote:

>
>
>
>
>
> On 15/03/2011 18:04, dkosiur wrote:
> > I've been trying to create a set of curves for a new paper on my Epson
> > 3880, but the initial curve never becomes a straight line after
> > linearization. Isn't it supposed to become a straight line?
> >
> > I read all the docs and did the following: printed the ink separation
> > chart and calculated my ink limits for K, LK, and LLK inks. (The numbers
> > were K: 55%, LK: 46%, LLK: 14%.) After inserting those numbers into my
> > new curve file and installing the file, I printed the
> > Step-21x4-random.tif file and used my Datacolor 1005 spectrophotometer
> > and Spyder3Print software on a Mac to read the swatches. After running
> > the resulting file through QTR-Linearize-Data, the result came out as a
> > curve.
> >
> > ...
>
> >
> > LINEARIZE="96.085 93.5125 91.435 89.3875 86.9875 84.455 81.6075 77.57
> > 74.915 71.8225 68.355 64.405 60.4925 56.3575 52.4375 47.6275 43.1525
> > 35.9175 27.3475 16.14 6.5975"
> >
> > Is this the way it should be? Did I do something wrong? Am I
> > mis-interrpeting the word "linearize" here?
> >
> > Any help/explanation would be greatly appreciated.
> >
> > Many thanks,
> > Dave
> >
> >
>
> --
> mike finley photography
> fine art photography and website construction
> http://mypicks.efikim.co.uk
> http://www.mikefinley.co.uk
> http://www.roguegenecollective.com/Mike_Finley.html
> http://www.efikim.co.uk
>
>  
>


[Non-text portions of this message have been removed]

I haven't yet transferred the Linearized data to my curve because I thought linearized meant "linear", as in a straight line. I will do that and print the target again.

Thanks

--- In QuadtoneRIP@yahoogroups.com, Michael King <drmrking@...> wrote:

>
> >>Not sure how far you've gone but just to be sure, have you added the
> >>Linearize data generated to the qidf file and regenerated the quad file?
> 
> and then print the target with that new .quad file that includes
> linearization data?
> 
> Also you need to be 100% sure that you are printing without icc profile to
> create profile. Easy to do in QTR on Windows (its a standalone app) but on
> the Mac its not a standalone app so not sure how you print without profile.
> 
> Then when you print the target you need to again to consider whether you are
> printing with or without icc profile. A target with gamma 2.2 profile will
> give you a gamma 2.2 curve :)
> 
> Mike
> 
> On 15 March 2011 18:52, Mike Finley <mike@...> wrote:
> 
> >
> >
> >
> >
> >
> > On 15/03/2011 18:04, dkosiur wrote:
> > > I've been trying to create a set of curves for a new paper on my Epson
> > > 3880, but the initial curve never becomes a straight line after
> > > linearization. Isn't it supposed to become a straight line?
> > >
> > > I read all the docs and did the following: printed the ink separation
> > > chart and calculated my ink limits for K, LK, and LLK inks. (The numbers
> > > were K: 55%, LK: 46%, LLK: 14%.) After inserting those numbers into my
> > > new curve file and installing the file, I printed the
> > > Step-21x4-random.tif file and used my Datacolor 1005 spectrophotometer
> > > and Spyder3Print software on a Mac to read the swatches. After running
> > > the resulting file through QTR-Linearize-Data, the result came out as a
> > > curve.
> > >
> > > ...
> >
> > >
> > > LINEARIZE="96.085 93.5125 91.435 89.3875 86.9875 84.455 81.6075 77.57
> > > 74.915 71.8225 68.355 64.405 60.4925 56.3575 52.4375 47.6275 43.1525
> > > 35.9175 27.3475 16.14 6.5975"
> > >
> > > Is this the way it should be? Did I do something wrong? Am I
> > > mis-interrpeting the word "linearize" here?
> > >
> > > Any help/explanation would be greatly appreciated.
> > >
> > > Many thanks,
> > > Dave
> > >
> > >
> >
> > --
> > mike finley photography
> > fine art photography and website construction
> > http://mypicks.efikim.co.uk
> > http://www.mikefinley.co.uk
> > http://www.roguegenecollective.com/Mike_Finley.html
> > http://www.efikim.co.uk
> >
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]
>

Now I understand! (I think [grin[) The "Linearize" data created by QTR-Linearize-Data for my paper describes what's needed to bring an image's tones to the straight line. So the correction itself (what's generated by QTR-Linearize-Data) is what QTR applies to an image.

When I use the new .quad file, which includes the linearize data, to print the target again and measure the values, running that set of points through QTR-Linearize-Data now shows as a straight line.

Dave

--- In QuadtoneRIP@yahoogroups.com, "dkosiur" <dkosiur@...> wrote:

>
> I haven't yet transferred the Linearized data to my curve because I thought linearized meant "linear", as in a straight line. I will do that and print the target again.
> 
> Thanks
> 
> --- In QuadtoneRIP@yahoogroups.com, Michael King <drmrking@> wrote:
> >
> > >>Not sure how far you've gone but just to be sure, have you added the
> > >>Linearize data generated to the qidf file and regenerated the quad file?
> > 
> > and then print the target with that new .quad file that includes
> > linearization data?
> > 
> > Also you need to be 100% sure that you are printing without icc profile to
> > create profile. Easy to do in QTR on Windows (its a standalone app) but on
> > the Mac its not a standalone app so not sure how you print without profile.
> > 
> > Then when you print the target you need to again to consider whether you are
> > printing with or without icc profile. A target with gamma 2.2 profile will
> > give you a gamma 2.2 curve :)
> > 
> > Mike
> > 
> > On 15 March 2011 18:52, Mike Finley <mike@> wrote:
> > 
> > >
> > >
> > >
> > >
> > >
> > > On 15/03/2011 18:04, dkosiur wrote:
> > > > I've been trying to create a set of curves for a new paper on my Epson
> > > > 3880, but the initial curve never becomes a straight line after
> > > > linearization. Isn't it supposed to become a straight line?
> > > >
> > > > I read all the docs and did the following: printed the ink separation
> > > > chart and calculated my ink limits for K, LK, and LLK inks. (The numbers
> > > > were K: 55%, LK: 46%, LLK: 14%.) After inserting those numbers into my
> > > > new curve file and installing the file, I printed the
> > > > Step-21x4-random.tif file and used my Datacolor 1005 spectrophotometer
> > > > and Spyder3Print software on a Mac to read the swatches. After running
> > > > the resulting file through QTR-Linearize-Data, the result came out as a
> > > > curve.
> > > >
> > > > ...
> > >
> > > >
> > > > LINEARIZE="96.085 93.5125 91.435 89.3875 86.9875 84.455 81.6075 77.57
> > > > 74.915 71.8225 68.355 64.405 60.4925 56.3575 52.4375 47.6275 43.1525
> > > > 35.9175 27.3475 16.14 6.5975"
> > > >
> > > > Is this the way it should be? Did I do something wrong? Am I
> > > > mis-interrpeting the word "linearize" here?
> > > >
> > > > Any help/explanation would be greatly appreciated.
> > > >
> > > > Many thanks,
> > > > Dave
> > > >
> > > >
> > >
> > > --
> > > mike finley photography
> > > fine art photography and website construction
> > > http://mypicks.efikim.co.uk
> > > http://www.mikefinley.co.uk
> > > http://www.roguegenecollective.com/Mike_Finley.html
> > > http://www.efikim.co.uk
> > >
> > >  
> > >
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
>