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Regards,
Mike

It'll display the TRC for channels 0,1,2 (RGB) simultaneously: click on the A2B1 tag, click the Input Channels tab.  The input channels are the TRC and one exists for each A2B look up table.

Not sure where to find info on the VCGT spec/format.  It doesn't look like it is part of the ICC spec so it might be an add-on (like black point compensation).

Mike

I agree. Would love to see an overlap added to the poster feature. I've worked a lot with joining mapping in the past so much easier, and accurate, to join with an overlap

Mike:

As it turns out, long ago I downloaded and "installed" Profile Inspector. I didn't find much use for it and have all but forgotten it because I didn't find it displayed much that I understood. Thanks to you, I now understand a little. I'm disappointed that it will not plot the rgbTRC simultaneously. Also, can you point me to a source that explains the contents of the vcgt table? Thanks.

Cheers, Peter

This is the best free ICC profile inspecting tool.  It will allow you to look at the tables and TRC but it doesn't do 3D gamut graphics:

https://www.color.org/profileinspector.xalter

Mike

Mike:

Loading, as you have described and I have done, a (ridiculous) profile should not, as you have explained to me, make "no" difference as the OS does not perform color management. I expected that thanks to you. Now you have additionally educated me: the profiling program I use, currently Spyder, formerly xRite (ColorMunki), have installed a program that auto-loads the TRC in the LUT when a new profile is selected. As described, not all profiles change what I interpret as a color temperature change. I presume that means that not all profiles have a TRC embedded. Is there a utility that allows checking if a TRC is embedded in the profile? And allows me to look at it? If the LUT varies by RGB, then that would confirm color changes due to the TRC/LUT. And that would make my understanding of color management implementation just a little more compete.

Cheers, Peter

If I go to Color Management in Windows 11 (Windows 10 is similar), I get the attached screen.  I can add a profile that should make a ridiculous change like ProPhoto or Wide Gamut RGB and then select it on that screen or under "Display Settings".  Doesn't make any difference: I get no change whatsoever on the screen when it should make a huge change if it was actually doing something (anything).

If you are getting a change, you probably have a utility installed that loads the TRC found in the profile: which can change color.  Many monitor profiling tools like the Spyder, ColorMunki, etc. auto-install those pre-calibration utilities.

Regards,
Mike

Mike:

I know you have a business to run so I don't want to take up too much of your time. I hope this will be my last time querying you. On the other hand, responding to customer's, such as me, is part of your business...

Your responses to my questions have enlightened me. But, there remains one puzzle. In Win 10 I can adjust in Display Settings ( right click on desktop, choose Display Settings from the drop down - I'm explicit to be sure we're on the same page) to I choose a color profile different from the default  profile generated at my last profiling session to some other in the drop down list. It can be any profile such any of the computer manufacturer's preloaded profiles. Or it could be profiles such as  sRGB, aRGB, etc. that I have manually loaded via the advanced color settings interface. The display immediately appears to change color temperature and brightness. I suspect that Explorer windows, OS settings windows, browser windows, etc. reflect what is in the LUT changing gamma and overall brightness. And I expect, as you have explained, the OS does not apply the profile proper to the display. The question is, why does the color temperature appear to change? Or am I mistaken and what appears to me to be a color temperature change is really just an apparent color shift due to the change in brightness? Or even slight differences in the RGB LUT relative values generating slight tints. Though the slight tints here just happen to emulate lower color temperature.

An additional point: Using the keyboard - I'm working on a laptop for this discussion - monitor brightness control does not give the what I'm calling the color temperature change, warming, effect. Whatever is happening, as described above, is not just a simple dimming of the display.

Thanks for your insights.
Cheers, Peter

To rephrase your observation: When I wake up and stretch... and I don't feel wood on either side, It's a good day.
Fred

Hi Fred, thankyou, he is getting long in the tooth too!! me to, 70 next year but wake up every morning see the ceiling and no it's alight. Russ.