Pages: [1]   Go Down

Author Topic: Colormunki on CRT?  (Read 3571 times)

walter.sk

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 1433
Colormunki on CRT?
« on: June 17, 2010, 05:46:44 pm »

I read the info on the X-Rite website concerning the use of the Munki on a CRT, but I have some more questions.

I have used my HP-APS software with an i1Display ii to profile a LaCie CRT on a Mac OS10.6 machine, and have adjusted the Brightness, Contrast and R,G&B settings to get  targets of 90 cd/m2 at a D65 white point and gamma of 2.2.

I tried using the Munki and its software on the same system, and got what seems to be a good profile using the LCD option on the Munki.  However, would I be better off setting the Contrast or the Brightness control when the Munki asks to adjust the Brightness?  And do I lose accuracy by not setting the R,G &B controls on the monitor?  I assume that the Munki does it by changing the video card's LUT rather than actually calibrating the monitor first, which is what I believe I had been doing with the i1Dii.

Or, as I suspect, is my little bit of knowlege really more dangerous than helpful?
Logged

Czornyj

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 1873
    • zarzadzaniebarwa.pl
Colormunki on CRT?
« Reply #1 on: June 17, 2010, 06:25:18 pm »

Quote from: walter.sk
I read the info on the X-Rite website concerning the use of the Munki on a CRT, but I have some more questions.

I have used my HP-APS software with an i1Display ii to profile a LaCie CRT on a Mac OS10.6 machine, and have adjusted the Brightness, Contrast and R,G&B settings to get  targets of 90 cd/m2 at a D65 white point and gamma of 2.2.

I tried using the Munki and its software on the same system, and got what seems to be a good profile using the LCD option on the Munki.  However, would I be better off setting the Contrast or the Brightness control when the Munki asks to adjust the Brightness?  And do I lose accuracy by not setting the R,G &B controls on the monitor?  I assume that the Munki does it by changing the video card's LUT rather than actually calibrating the monitor first, which is what I believe I had been doing with the i1Dii.

Or, as I suspect, is my little bit of knowlege really more dangerous than helpful?

In CRT "Contrast" calibrates white point luminance, and "Brightness" calibrates black point luminance. And yes, it's nice to calibrate black&white points and RGB gain by setting controls on the monitor. The problem is that ColorMunki software is simplified to the point of idiocy, so there's no way to do this. I think it's possible with ArgyllCMS, but that one is - on the contrary - terribly complicated CLI program. Using DispcalGUI might be helpful:
www.argyllcms.com
http://hoech.net/dispcalGUI/
« Last Edit: June 18, 2010, 07:58:29 am by Czornyj »
Logged

Pat Herold

  • Full Member
  • ***
  • Offline Offline
  • Posts: 161
Colormunki on CRT?
« Reply #2 on: June 17, 2010, 08:45:19 pm »

Unlike LCD's, it always helps to adjust the guns on a CRT to get as close to your white point as you reasonably can.  True, the software will adjust the video card to make up the difference if it has to, but it's always nice to not have to make the software and video card work too hard - especially since the natural" state of a CRT is often up there around 9800K.

Read myths #14 and #15 for more info on Contrast and Brightness:
http://www.colorwiki.com/wiki/Color_Management_Myths_11-15
Logged
-Patrick Herold
  Tech Support,  chromix.com

walter.sk

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 1433
Colormunki on CRT?
« Reply #3 on: June 23, 2010, 10:33:26 am »

Quote from: pherold
Unlike LCD's, it always helps to adjust the guns on a CRT to get as close to your white point as you reasonably can.  True, the software will adjust the video card to make up the difference if it has to, but it's always nice to not have to make the software and video card work too hard - especially since the natural" state of a CRT is often up there around 9800K.

Read myths #14 and #15 for more info on Contrast and Brightness:
http://www.colorwiki.com/wiki/Color_Management_Myths_11-15
Thanks for the link.  I just had time to read it.  I found the whole article very useful.  It's amazing how much passes for real knowledge!
Logged

neil snape

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 1414
    • http://www.neilsnape.com
Colormunki on CRT?
« Reply #4 on: June 25, 2010, 06:08:51 am »

CM and CRT doesn't result in a very good profile in my experience.

I suppose if the CM was implemented in other than Eizo and through CL in Argyll, you could make it work. After all it is a 20nm band spectro.
Logged

digitaldog

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 17020
    • http://www.digitaldog.net/
Colormunki on CRT?
« Reply #5 on: June 25, 2010, 09:15:51 am »

Quote from: neil snape
CM and CRT doesn't result in a very good profile in my experience.

I suspect its the software far more than the hardware. The CM software probably assumes an LCD. I can’t imagine why that hardware would have issues with a CRT but I can imagine the software it ships with does.
Logged
Andrew Rodney
Author “Color Management for Photographers"
Pages: [1]   Go Up