Tod: you provided us with too little info. Maybe you simply profile your display to unnecessarily high luminance? What CIELAB numbers you are getting? What target values for monitor calibration you are using? For example, if you are using values around 140 cd, no wonder if values do not match. Some difference is inevitable, but if you not provide numbers, we cant judge. Regards Kamil Tresnak
Message: 1 Date: Thu, 29 Mar 2012 12:30:09 -0400 From: Hugo Caceres <hcaceres@gwmail.gwu.edu> To: colorsync-users@lists.apple.com Subject: Comparing color performance on Displays Message-ID: <CAMr1useOkzeAo_e-YhJF9_FxYb5DgqdF2Qwj9HRD1iNJ+h4avA@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1
Hello,
I was curious about how one can find an optimal standard set of colors in CIELAB to compare the performance of different liquid crystal displays to. For example, if I wanted to know how far the color reproduction of my display is to that of a defined set of colors, then I would measure the CIELAB of the 24 Gretagmacbeth colorchecker on the display and compare it to the known CIELAB values in the card. This will give me a Delta-E I can use to determine the difference. The problem is the CIELAB values of the display have very high luminance as opposed to the CIELAB values on the colorchecker. Does anyone know a why one can compare the colors of an LCD to a well-defined base that is reflective?
Regards, Tod Canete
______________________________________________________________
Od: colorsync-users-request@lists.apple.com Komu: <colorsync-users@lists.apple.com> Datum: 30.03.2012 21:07 Předmět: Colorsync-users Digest, Vol 9, Issue 55
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1. Aperture 3 import color issues (davidbmoore) 2. Re: Colorsync-users Digest, Vol 9, Issue 54 (Dan Gillespie)
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Message: 1 Date: Thu, 29 Mar 2012 12:47:02 -0700 From: davidbmoore <dmoore10@cox.net> To: colorsync-users@lists.apple.com Subject: Aperture 3 import color issues Message-ID: <7C81C657-09EA-46B5-8598-A7491509268E@cox.net> Content-Type: text/plain; charset=windows-1252
Sorry if this has been covered……please point me to the correct posts.
Aperture imports a tif Adobe98 file and hoses the colors. Example: a fill of (72, 182, 70) in an A98 file imports into AP3 with a major color change. If I take that same file and convert it in PS to sRGB then import that to AP3 the colors basically are the same as the non imported A98 file in PS. Some think things changed when AP3 came out and others think it is a Lion issue. I think Colorsync is the color engine for Aperture… How can color issues happen in an Apple product? Thanks for all helpful suggestions. DAvid
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Message: 2 Date: Thu, 29 Mar 2012 16:03:39 -0400 From: Dan Gillespie <dgillespie@colorgeek.com> To: colorsync-users@lists.apple.com Subject: Re: Colorsync-users Digest, Vol 9, Issue 54 Message-ID: <0DC8CEB6-FC3A-4493-B1BE-61D6FF57CF57@colorgeek.com> Content-Type: text/plain; charset=us-ascii
Tod,
You can do this in the new i1Profiler software. You can compare to the 24 ColorChecker values or to printing standards/specifications like GRACoL or Fogra. You can read more in the blog I wrote about it here: http://everydaycolormanagement.blogspot.com/2012/01/eizo-vs-nec-monitor-cali....
Hope this helps,
Dan Gillespie 717.475.9007 Toll Free 1.877.COL-RMGT dan@colormanagement.com www.colormanagement.com | www.colormanagementgroup.com
On Mar 29, 2012, at 3:00 PM, colorsync-users-request@lists.apple.com wrote:
Message: 1 Date: Thu, 29 Mar 2012 12:30:09 -0400 From: Hugo Caceres <hcaceres@gwmail.gwu.edu> To: colorsync-users@lists.apple.com Subject: Comparing color performance on Displays Message-ID: <CAMr1useOkzeAo_e-YhJF9_FxYb5DgqdF2Qwj9HRD1iNJ+h4avA@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1
Hello,
I was curious about how one can find an optimal standard set of colors in CIELAB to compare the performance of different liquid crystal displays to. For example, if I wanted to know how far the color reproduction of my display is to that of a defined set of colors, then I would measure the CIELAB of the 24 Gretagmacbeth colorchecker on the display and compare it to the known CIELAB values in the card. This will give me a Delta-E I can use to determine the difference. The problem is the CIELAB values of the display have very high luminance as opposed to the CIELAB values on the colorchecker. Does anyone know a why one can compare the colors of an LCD to a well-defined base that is reflective?
Regards, Tod Canete
On Mar 29, 2012, at 3:00 PM, colorsync-users-request@lists.apple.com wrote:
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Today's Topics:
1. Comparing color performance on Displays (Hugo Caceres)
----------------------------------------------------------------------
Message: 1 Date: Thu, 29 Mar 2012 12:30:09 -0400 From: Hugo Caceres <hcaceres@gwmail.gwu.edu> To: colorsync-users@lists.apple.com Subject: Comparing color performance on Displays Message-ID: <CAMr1useOkzeAo_e-YhJF9_FxYb5DgqdF2Qwj9HRD1iNJ+h4avA@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1
Hello,
I was curious about how one can find an optimal standard set of colors in CIELAB to compare the performance of different liquid crystal displays to. For example, if I wanted to know how far the color reproduction of my display is to that of a defined set of colors, then I would measure the CIELAB of the 24 Gretagmacbeth colorchecker on the display and compare it to the known CIELAB values in the card. This will give me a Delta-E I can use to determine the difference. The problem is the CIELAB values of the display have very high luminance as opposed to the CIELAB values on the colorchecker. Does anyone know a why one can compare the colors of an LCD to a well-defined base that is reflective?
Regards, Tod Canete
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