Re: ProfileMaker 5
Re: ProfileMaker 5
- Subject: Re: ProfileMaker 5
- From: Marco Ugolini <email@hidden>
- Date: Sun, 13 Aug 2006 18:24:42 -0700
In a message dated 8/13/06 5:37 AM, Steve Clark wrote:
> I've been using Monaco with a DTP41UV for about 4 years now at work.
> I recently bought a system for home and decided to get the Eye1 with
> the PMP 5. I did not get the the UV cut on the Eye1. I'm getting
> really poor profiles for my Epson 7800 and 4000 on Somerset Enhanced
> RW and Epson Ultrasmooth. I compared my previous Monaco generated
> profiles to the new PMP in ColorThink and the gamut is larger and the
> surface is much smoother. Visually, the prints I make with the PMP
> profiles are dead and I cannot reproduce deep red, blues and greens.
> Oddly enough when I print with the old Monaco profiles the results
> are great. I noticed the optical brightener compensation checkbox is
> grayed out which I guess is because the measurement file does not
> have spectral data. In Measure Tool the configuration is for Eye1
> Pro, Reflective, and Spectral. Why would I not be able to check the "
> Correct for Optical Brighteners" box in PMP?
>
> Is there a way to open the measurement file to see if the spectral
> data is in it?
I cannot speak to why your Monaco profiles for these papers are superior to
those made with ProfileMaker, though I would not rule out user error as a
possibility, all the more so since you are new to ProfileMaker.
But regarding the issue of spectral vs. colorimetric readings in measurement
files produced from printed testcharts, ProfileMaker allows the user to
choose the spectral reading mode independently of whether the readings are
reflective or emissive. So, one is able to read spectrally in either mode.
If the "Spectral" box is checked in MeasureTool's Instrument Configuration
dialog box, and if the instrument is found by the application and you see an
"OK" in the lower-left corner of the dialog box, then your measurements will
be spectral.
Also, if you produce a measurement file and then open it using a text editor
(TextEdit or MS Word), or, even better, Excel, you will see that after a few
lines of "introductory stuff" (fancy technical term, that one!), the numbers
start, aligned in columns each of which is clearly indicated with its own
header.
If the data are just colorimetric (i.e., not spectral), the column headers
for measurements from a CMYK test chart will read something like: CMYK_C,
CMYK_M, CMYK_Y, CMYK_K, XYZ_X, XYZ_Y, XYZ_Z, LAB_L, LAB_A, LAB_B.
If the data are spectral, the column headers will instead read something
like: CMYK_C, CMYK_M, CMYK_Y, CMYK_K, nm380, nm390, nm400, nm410...nm730
(again, for a CMYK test chart). The "nm380, etc." nomenclature indicates the
specific wavelength of the visible spectrum whose energy is being measured.
The human-visible spectrum goes from about 400 to 700 nanometers (nm).
Only if your measurement data are spectral will ProfileMaker be able to
enable the "Correct for Optical Brighteners" check box. That option is not
available with measurement data that are purely colorimetric, because
optical brighteners produce an energy spike that can only be detected by
means of a spectral reading within a narrow range of the visible spectrum (I
believe, somewhere between 380 and 400nm).
I hope that helps. Good luck.
--------------
Marco Ugolini
Mill Valley, CA
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