Digital BW, The Print

Paul Roark wrote

> My original hope was that people could do paper profiles as Transfer
> Functions to be applied after the usual variable-tone curve was applied.  I
> did a rough one for Somerset Enhanced, for example.
>
> I never envisioned everyone tweaking the curves.
>
> I think the primary failure of the vm approach is that there has been no
> pooling of such profiles, which I anticipated would happen.  Admittedly, the
> transfer function tool is crude, which could be part of the problem.
> However, I thought that doing rough profiles by just printing a 21-step test
> file and correcting for the amount by which the steps are off would be easy
> enough that people would just do it manually.

I am keen to contribute to the pool, if it's within my capabilities.

Paul, do you have a step-by-step description of the process? I imagine it
involves printing stepped gradients on the paper to be 'profiled', and making
iterative changes to the transfer function to match the printout to a standard?

Is a flatbed scanner a sufficient measuring device? (I don't have a densitometer
in my kit, or in my budget).

Can you suggest some papers that would benefit from transfer functions?

Anyone else willing to share?

Peter Marquis-Kyle

While this is a good idea...you will not be achieving the optimal ink load
for each paper...once again a limit of the Epson driver...it is a good cheap
solution, however.

Robert

On 5/8/02 5:43 PM, "Peter Marquis-Kyle" <petermk@...> wrote:

> Paul Roark wrote
> 
>> My original hope was that people could do paper profiles as Transfer
>> Functions to be applied after the usual variable-tone curve was applied.  I
>> did a rough one for Somerset Enhanced, for example.
>> 
>> I never envisioned everyone tweaking the curves.
>> 
>> I think the primary failure of the vm approach is that there has been no
>> pooling of such profiles, which I anticipated would happen.  Admittedly, the
>> transfer function tool is crude, which could be part of the problem.
>> However, I thought that doing rough profiles by just printing a 21-step test
>> file and correcting for the amount by which the steps are off would be easy
>> enough that people would just do it manually.
> 
> I am keen to contribute to the pool, if it's within my capabilities.
> 
> Paul, do you have a step-by-step description of the process? I imagine it
> involves printing stepped gradients on the paper to be 'profiled', and making
> iterative changes to the transfer function to match the printout to a
> standard?
> 
> Is a flatbed scanner a sufficient measuring device? (I don't have a
> densitometer
> in my kit, or in my budget).
> 
> Can you suggest some papers that would benefit from transfer functions?
> 
> Anyone else willing to share?
> 
> Peter Marquis-Kyle

--- In DigitalBlackandWhiteThePrint@y..., "Peter Marquis-Kyle" 
<petermk@o...> wrote:
> 
> I am keen to contribute to the pool, if it's within my capabilities.
> 
> Paul, do you have a step-by-step description of the process? I 
imagine it
> involves printing stepped gradients on the paper to be 'profiled', 
and making
> iterative changes to the transfer function to match the printout to 
a standard?
> 
> Is a flatbed scanner a sufficient measuring device? (I don't have a 
densitometer
> in my kit, or in my budget).


Peter:

Thanks for volunteering.  I've posted the scanner based workflow I 
used to create the FS RGB partitioned workflow for the 1160 in the 
Files section of this group (make_profile2.pdf) in:

Files> Ink set reviews and techniques> MIS FS

The 1160 FS workflow can be found in: 

Files> Ink set reviews and techniques> MIS FS>1160 Partitioned 
Workflow

In general, the curve making approach can be used to generate 
partitioned and lumped (non-partitioned) curves for any quad inkset 
with inks of any density and color postitions.

Good Luck

Jeff Randall

Peter,

Between what you already said, below, and what Jeff has contributed, I think
you have a good idea of how it's done.  Then it's just experience.

Actually, I made the first ones for printing Piezo with the Epson driver
just by using a Piezo print of the 21-step test file and then eyeballing the
test prints compared to the Piezo print.  You can actually do a fairly good
job just using your eyes and doing a side-by-side comparison.

That said, I used a scanner for most and now use a densitomer if doing the
curves in-house.

Paul
http://www.PaulRoark.com


__________________________

--- In DigitalBlackandWhiteThePrint@y..., "Peter Marquis-Kyle"
<petermk@o...> wrote:
>
> I am keen to contribute to the pool, if it's within my capabilities.
>
> Paul, do you have a step-by-step description of the process? I
imagine it
> involves printing stepped gradients on the paper to be 'profiled',
and making
> iterative changes to the transfer function to match the printout to
a standard?
>
> Is a flatbed scanner a sufficient measuring device? (I don't have a
densitometer
> in my kit, or in my budget).




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