[argyllcms] Re: Blue goes purple

  • From: Edgar Scholz <hipescho@xxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 25 Jun 2011 23:58:03 +0200

Am 25.06.2011 22:19, schrieb Sam Berry:
Have you seen this page (towards the bottom) http://www.brucelindbloom.com/index.html?MunsellCalcHelp.html?

It documents a fairly common problem which may be the effect you are experiencing.

Regards,
Sam Berry

ThankYou for the link to this interesting site. I haven´t seen this site before, but I read a bit about this problem with the "printer-gammut" on other sites. But... I have no problems with colors on a printer, a have a problem with the colors on my screen.

I will tell in easy words, how I understand color management files, generated by ArgyllCMS. When I´m wrong, please correct me.

This whole stuff is done in two steps:

1. Calibrating the monitor
Argyll generate some color-patterns, which are measured by a colorimeter. This results in a cal-file, which can be used to fill the LUT of the videocard. With that step, the colors should be displayed on the monitor correctly.
Until now, all is fine for me. My monitor is calibrated and blue is blue.

2. Generating a profile for CM
Depending on step 1, some color-patterns are generated by Argyll and measured with my Colorimeter. The result of this measurement is used to generate an icc-profile. And in this step, something goes wrong for me. In this step, blue turns to purple.

I do not understand, why my calibrated monitor shows a correct nice blue. But enabling CM in software, that means using the icc.profile, blue turns to purple. When this really is a gammut issue, what can I do to correct this?

I think, tomorrow I`ll calibrate another monitor on another PC, to see what happens...

Edgar

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