Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Tyler Boley" <tyler@t...> 
wrote:
> Roy- Outstanding! This is probably obvious, but I want to doublecheck
> with you. The values below look like RGB numbers, which suprises me a
> tad for a profiling reference file, rather than LAB. So RGB values are
> what Match wants to see?

Yes, everything is based on RGB values presumably because that's what
most people use.  Under the Eye-Match directory (folder)  there are
TIFF target files -- lots of random color patches.  There's one called
"i1 RGB  1.5.tif"  and under Reference files the file "i1 RGB 1.5.txt" is
a standard text file describing all the RGB values from the tif file.

So instead of these files, I'm using my 21step wedge that was designed
for eye-one reading Step-21-random.tif  in the Eye-One folder.
I had a Ref file for it but in grayscale description instead of RGB.   
I just edited the Ref file into RGB values:
      R = G = B = (100-gray) * 2.55

Fortunately, i1Match is perfectly happy as long as the description
Ref file matches what you actually scan.


> Also, can I assume from your work here that I can create my own
> targets and ref files as you have done? I'd like more than 21 patches,
> I find these profiles don't predict some areas well, like 95 to 100%,
> and more samples might help.

I also have a 51 patch target that'll give you every 2%, I'll can send you
a new RGB Ref file for it.

> You guys are smokin' now!

I hadn't really thought about soft proofing much, except with the eyeball
custom dot gain.  But when Carl brought up the idea and what he
had done, it was a terrific idea.

Roy

> Tyler
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roy Harrington"
> <roy@h...> wrote:
> > 
> > Hi Carl,
> > 
> > I see you've been scratching away at this, too.   I've also been
> figuring
> > out how to use this.  I managed to figure out that the reference files
> > names are hard coded into Eye-One Match so that why we haven't been
> > able to get it to recognize other Ref files.  So I converted the 21 step
> > Ref file to an RGB description rather than Grayscale, and just overwrote
> > the existing i1 RGB 1.5 file (save it first).  This works like a charm.
> > 
> > Just use the ordinary step-21-random.tif file for printing -- in fact I
> > already had linearized print outs from before.   All you need to do is
> > run i1Match and scan the strip.  Voila instant soft-proofs and it'll
> > work for any kind of grayscale output scheme -- QTR, Roark, Piezo.
> > 
> > Roy
> > www.harrington.com
> > 
> > Here's the new ref file:
> > 
> > Date: 9/8/2003  Time: 18:47
> > LGOROWLENGTH 01
> > BEGIN_DATA_FORMAT
> > SampleName	RGB_R RGB_G RGB_B
> > END_DATA_FORMAT
> > BEGIN_DATA
> > A1	178.5	178.5	178.5
> > B1	76.5	76.5	76.5
> > C1	242.25	242.25	242.25
> > D1	140.25	140.25	140.25
> > E1	38.25	38.25	38.25
> > F1	204	204	204
> > G1	102	102	102
> > H1	0	0	0
> > I1	165.75	165.75	165.75
> > J1	63.75	63.75	63.75
> > K1	229.5	229.5	229.5
> > L1	127.5	127.5	127.5
> > M1	25.5	25.5	25.5
> > N1	191.25	191.25	191.25
> > O1	89.25	89.25	89.25
> > P1	255	255	255
> > Q1	153	153	153
> > R1	51	51	51
> > S1	216.75	216.75	216.75
> > T1	114.75	114.75	114.75
> > U1	12.75	12.75	12.75
> > END_DATA
> > 
> > 
> > --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carl Schofield
> <scho@m...> 
> > wrote:
> > > I've found a way to strip read the targets.  I used ColorLab to
> create 
> > > new reference and target files from the original i1 RGB 1.5 reference 
> > > file.  I converted the target tif to LAB-L and then gray (gamma
> 2.2) as 
> > > before for printing. The new reference file is placed in the
> reference 
> > > files>printer>eye-one> folder in the ProfileMaker Pro folder so it
> can 
> > > be accessed by MeasureTool.  The new target tif file has borders
> around 
> > > the patches and it is easily strip read in MeasureTool.  You need to 
> > > check spectral data in the configuration and then pick the new target 
> > > reference file from the chart pop-up list and specify strips with
> gaps 
> > > before reading the strips.  The data is saved from MeasureTool as a 
> > > text document and the file is placed in the i1Match measurement 
> > > data>printer folder.  Next, open i1Match, select the radio button
> "load 
> > > the measured chart" and open the file that was read and saved from 
> > > MeasureTool.  i1Match will then create the profile and it did so 
> > > without errors on my first try.  I've added the new target and 
> > > reference files to the Softproof archive on my filesharing site for 
> > > those that want to try making their own softproof icc profiles
> with the 
> > > eye-one.
> > > 
> > > Carl
> > > 
> > > On Tuesday, January 13, 2004, at 03:15  PM, Carl Schofield wrote:
> > > 
> > > > I recently discovered (stumbled across) a way to create standard icc
> > > > profiles that can be used for soft-proofing QTR prints in Photoshop.
> > > > I've put a sample soft-proof profile that was created from an icc
> > > > profile for a QTR sepia curve that I use quite often in an
> archive on
> > > > my filesharing site.  Just drop the proof profile (sepia1.psf)
> in the
> > > > folder Library>Application Support>Adobe>Color>Proofing and
> follow the
> > > > illustrated instructions for using the soft-proof in the read-me
> file
> > > > that is also in the archive.  You don't need to be using or have QTR
> > > > installed to just see how any RGB or grayscale image you have will
> > > > actually look if it were printed with QTR and the sepia curve I'm
> > > > using. The read-me also has instructions for creating the icc
> profiles
> > > > if you want to make your own.  This can be applied to any
> inkset/paper
> > > > and probably with quad workflows other than QTR as well.  One of the
> > > > nice things about using standard icc soft-proof profiles is that you
> > > > can work up your image for printing in any mode (full RGB color or
> > > > grayscale) and get a preview of the printed results as you do RGB to
> > > > grayscale conversions, curve adjustments, etc. with the soft-proof
> > > > turned on.
> > > >
> > > > The softproof archive with the profile and tutorial is in the QTR
> > > > Soft-proof folder at:
> > > >
> > > > http://homepage.mac.com/scho/FileSharing2.html