Matteo, I want to take one more opportunity to round up some of this dialogue and put perspective on it. I’ll put my summary up-front:
- One way or another darktable should be able to use your display profile, even in OSX;
- The internal working profile sounds like it should be your real concern.
I just read the darktable page on color management, and between its default behavior for getting the display profile and the manual alternative you shouldn’t be having a display problem. Whatever working profile the internal image has, darktable should be able to convert it to display gamut prior to displaying.
Now, absent from the page was any reference to the internal working profile. I may not have dug (googled) deeply enough, but if AdobeRGB is the internal working profile in darktable then you’re probably getting some color loss in-display. I plotted both your display profile and AdobeRGB (danged plot tool is a bit addicting…), and the display profile clearly encompasses AdobeRGB. This is probably behind @Elle’s recommendation in one of her articles to be using Rec2020 or some other wider-gamut working profile than AdobeRGB, as displays are outstripping it’s gamut. Maybe a darktable person here could shed some light on how it handles the internal working profile.
If I understand the Lightroom situation correctly, it hard-codes AdobeRGB as the working profile, so you may not find relief over there.
All that said, we’re talking about display, not file or device output. I don’t have a high-gamut display so take this with a grain of salt, but the chromatic differences between AdobeRGB (if that is indeed the working profile) and the ezio display profile are not that great on the plot and may not be readily discernible on the screen.
Where I think you want to pay close attention to gamut translation is in your final output to media; the gamuts of files and devices are far smaller than what you’ve worked with in editing, and the translation has to be handled with care to avoid blotching-up colors on the page or screen. I recently experienced this first-hand; I thought sRGB gamut would be small enough for raw display on a projector at church, and I was horribly wrong…
Anyway, I understand your frustration, just wanted to try to focus it on the right thing…