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MAC OS Color Management question for Hardware Calibration

326 Views 1 Reply Latest reply: May 25, 2013 8:29 AM by dbmoore RSS
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May 24, 2013 10:22 PM

Question: Currently, we are working on our HW Calibration SW on MAC OS. However, after we have applied our newly created profile as the default profile of the target display, the screen have changed. (For example, even if I have calibrated target display with 1.8 target gamma, if I apply our newly created profile as the default profile, the gamma of the target display have changed to 2.2 gamma.)

 

Is this situation is normal on MAC OS? Otherwise, is there anyway to prevent this situation? Even if I have applied Linear VGCT tag to our newly created profile, this situation was always happened. Is there any MAC OS API to disable or bypass the color management of MAC OS?

 

Please help me to find an answer of this situation.

Calibration Step of our Calibration SW for Hardware Calibration.

 

Steps:

  1. Set "Linear ICC Profile" profile which as the Default profile of target display.
  2. Do Gamma Calibration (Find target Gamma value)
  3. Do White point Calibration. (Find target Color Temperature)
  4. Do Brightness Calibration (Find target Brightness)
  5. Check calibration result status.
    • Comment: After we complete to do calibration, our Calibration SW measured current status of target display whether it have reached to target Brightness, Gamma and Color Temperature or not.
  6. Generate new ICC profile which applied current status of target display. (This profile contain Linear VCGT tag.)
  7. Adjust "Newly created ICC profile" as the default profile of the target display.
    • Commrnt: The below problem was happened after the default profile have changed to Newly created profile.

 

Problem:

After I configured this newly created ICC profile as the default profile, I have re-checked current status of target display. At this time the gamma value have returned to 2.2. (Example: Before I set newly created ICC profile, the current Gamma was 1.8, howver, after the newly created profile have configured to Default profile, the Gamma value have changed to 2.2)

 

 

Please give me any feedback about this situation? Is there any other MAC API to handle this situation? Otherwise, is this situation is normal in MAC OS environment?

MacBook Pro, Mac OS X (10.7), ColorManagement on MAC
  • dbmoore Level 1 Level 1 (95 points)

    Software SW  and Hardware HW calibration.   What Software are you using and does the color meter or spectral device come with the Software or is it third party.  Iv been using 2.2 gama for six years on the Mac and find it is just fine.  But if you want 1.8 and are not getting it Id say its the software used in calibrating that is not set up correctly. need more info.  cheers

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