RE: i1Profiler display measurements
RE: i1Profiler display measurements
- Subject: RE: i1Profiler display measurements
- From: Roger Breton <email@hidden>
- Date: Thu, 19 Feb 2015 09:06:21 -0500
Mark,
Your excellent points are thoroughly well taken.
First, thank’s for the suggestion to change the *.dmxf to *.xml, to allow opening the file under a browser. Sadly, that does not help change the presentation of the data (the nature of XML). Call me sentimental but I hate having to scroll the file up and down to find the data I am looking for? CIE XYZ values are stored at the beginning of the file while their corresponding RGB device values are at the end of the file. With PatchTool, I get the two served up under the same friendly graphic display. That’s an important value to me, Mark, since my time on earth is limited... I admit I have not looked at the CxF3 specs yet but, in order to decipher the DMXF format, for display measurements, at least, so far, one has to do a fair amount of “reverse-engineering”? Like, I find that “Measurement41” encapsulates the CIE XYZ for the monitor calibrated white point. But, if I search for the corresponding device RGB values, which should be RGB=255,255,255, nothing turns up readily? It’s not stored in the following piece of data but in a completely separate section, at the end of the file, in the “Target” section, as I said above. After I reasoned that the number “41” was the key to my search, it was a cinch to find the “Target41” entry and I was home free. There is a logic to the way the data is coded, no question, but it’s not for the faint of heart.
The …/i1 Profiler/Display Measurements subdirectory does exist on my system, but it’s empty? I have not checked to see whether it was empty *before* calibrating my monitor but it sure remained empty *after* calibrating, with the exception, of course, for the file “sample-i1Pro.dmxf which is placed there by the installer.
So, I am still not sure whether i1Profiler actually saves a copy of display measurements anywhere on the system other than in the resulting display profile? One has to drag and drop the profile onto the measurement icon, in i1Profiler, as Ethan pointed out yesterday, to actually force the software to serve up the data.
Best / Roger
From: Mark Stegman [mailto:email@hidden]
Sent: 19 février 2015 06:50
To: dpascale
Cc: Ethan Hansen; Roger Breton; 'colorsync-users?lists.apple.com' List
Subject: Re: i1Profiler display measurements
Roger, Ethan, Danny,
Far be it from me to try and steal any of Danny's thunder but I would like to make a contribution.
Lifting the bonnet on these things is NOT my area of expertise but, as I understand it the dmxf file is actually a CxF3 file (which is based on XML). If you change the extension to .xml you can open it in any browser, X-Code or even a text editor. The header reads...
<cc:CxF xmlns:cc="http://colorexchangeformat.com/CxF3-core"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
This also applies to the Patch Sets and the Profile Settings. I haven't explored all of the other folders but I would guess that its the same story. These folders can all be found in the Application Support folder (Library/Application Support/X-Rite/i1 Profiler/Display Measurements).
X-Rite published CxF3 as a proposed standard in 2009 and adopted xml as the platform in order to facilitate greater flexibility and acceptance. It is now going through the stages of being reviewed and adopted as an ISO standard. How useful this is in solving your current problems is another question. Patch Tool already provides you with many useful options.
For the record the measurement data should go into Library/Application Support/X-Rite/i1 Profiler/Display Measurements however, when I went to saved mine it did not default to this folder so I created one and placed it there (which is handy for exporting as already reported.
ANOTHER curious feature, or problem depending on your perspective, that I am having is that, once I have finished creating my display profile, I am warned that saving it to the System is not an option. It goes into the Library/Colorsync/Profiles/Displays folder. If I want to compare the profile to another (e.g. AdobeRGB) I am prevented from loading it or any other profiles into the 3D gamut view. I copied it to the same folder for the User (Me, the administrator) but I had to use my password even though I am logged on. I have since restarted the computer to see if that helped. Computer says "No!".
In an attempt to satisfy myself that this was a Profiler problem and not something else I created another display profile using it Color Navigator. I encountered a similar problem telling me that my privileges for the targeted folder (Display Profiles in the User's Library) were not to set to Me (which they are) and did not allow the profiled to be saved. where that leaves us I don't know.
The most positive thing I have gained from this discussion is losing my self doubt about my proficiency with i1 Profiler.
Mark
On Thu, Feb 19, 2015 at 8:22 AM, dpascale <email@hidden <mailto:email@hidden> > wrote:
Ethan,
"Can the Display-Reader module be used to measure the whitepoint for display measurement data? I'm thinking along the lines of showing a white patch, measuring it, and using that as the whitepoint value."
Yes. Here is a screenshot of the tool:
http://www.babelcolor.com/main_level/screen_shots/PatchTool_Display-Reader.htm
The export dialog:
http://www.babelcolor.com/main_level/screen_shots/PatchTool_Display-Reader_CGATS.htm
You can contact me offlist if you prefer.
Danny
----- Original Message ----- From: "Ethan Hansen" <email@hidden <mailto:email@hidden> >
To: "'dpascale'" <email@hidden <mailto:email@hidden> >; "'Roger Breton'" <email@hidden <mailto:email@hidden> >; "''colorsync-users?lists.apple.com <http://lists.apple.com> ' List'" <email@hidden <mailto:email@hidden> >
Sent: Wednesday, February 18, 2015 4:15 PM
Subject: RE: i1Profiler display measurements
From:
However, this is non-normalized emission data. In other words, the WhitePoint is not normalized to Y=100 and the display WhitePoint will likely not match a standard Illuminant.
When you open the cxf file, PatchTool will ask you to select an Illuminant, because it expects a reference Illuminant, which is always required for reflectance measurement. If your display is nearly spot-on a standard Illuminant (i.e. D50, D65), this selection makes sense. In most cases it does not.
Danny,
Thank you for helping clear up matters! Can the Display-Reader module be used to measure the whitepoint for display measurement data? I'm thinking along the lines of showing a white patch, measuring it, and using that as the whitepoint value.
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