Digital BW, The Print

Thanks again for your help Tyler.  It was your assistance and tips on 
using MeasureTool and ColorLab that got Roy and I on the right path 
using the Eye-One with QTR for linearization.

I was uncertain about how to convert the target to gray and thought 
that using LAB might be safest to start with (assuming luminance 
wouldn't change), but as you noted direct conversion to gray, keeping 
the same gamma, should also work fine.  Roy also suggested trying 
custom targets and reference files made with ColorLab and if i1Match 
doesn't accept them then perhaps the strip reading can be done in 
MeasureTool which has a provision for reading targets with boundaries 
between the patches without error checking.  I've been able to get 
i1Match to accept the standard target data that was patch read in 
MeasureTool so hopefully it will take strip read data as well.

I went way back into the archives of the lists and some older files on 
the net and re-read some of Dan's groundbreaking work in this area and 
his findings were certainly an inspiration to try this approach.

On Tuesday, January 13, 2004, at 05:27  PM, Tyler Boley wrote:

> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carl Schofield
> <scho@m...> wrote:
>> I recently discovered (stumbled across) a way to create standard icc
>> profiles that can be used for soft-proofing QTR prints in Photoshop.
>
> snip
>
> Nice work Carl, you got it exactly right. Have you tried going
> directly from RGB to gray with the target, rather than through LAB? If
> both are the same gamma it may work fine. I did it the LAB way, but am
> wondering about the effects of the various methods of getting to gray
> to print the target with our various output methods that want a single
> channel file.
> I've not discovered a way to get i1 photo to accept custom charts,
> tried a number of things. If you come across something that works let
> us know. Of course ProfileMaker will let you, but at a major cost.
> Until then I think you are stuck with single patch reading, the charts
> were designed with good color contrast from patch to patch so the
> convert to monochrome probably confuses it at some patch borders.
> Also, with ColorLab, you could design your own charts with patches in
> colors that might be more helpful for accuracy with these particular
> printing methods.
> Cool,
> Tyler
>
> PS- Culbertson surfaces yet again, years later.