Sizing up the ColorHug open source colorimeter

Posted Jun 1, 2012 18:38 UTC (Fri) by n8willis (subscriber, #43041)
In reply to: Sizing up the ColorHug open source colorimeter by jimparis
Parent article: Sizing up the ColorHug open source colorimeter

That's something I would want to ask about on the list (VMs); I'm not sure whether the Vm'ed application could properly access the video LUTs. Actually, it would sort of surprise me if it could ... seems like Argyll wouldn't be able to display accurate swatches without direct hardware access. But I'm sure someone else knows.

Nate

Sizing up the ColorHug open source colorimeter

Posted Jun 1, 2012 18:44 UTC (Fri) by jimparis (guest, #38647) [Link] (1 responses)

I thought someone would say that :) But I don't understand why it would need any special access to the video card -- it just writes an RGB value and measures what comes out. As long as the VM software sends the same RGB value to the screen (which they usually do), I'd think it would be fine.

Sizing up the ColorHug open source colorimeter

Posted Jun 7, 2012 21:59 UTC (Thu) by n8willis (subscriber, #43041) [Link]

The trick is that "just writes an RGB value" is not a simple or atomic operation. Ultimately the video driver has control over exactly what is sent to the display, so that is why the profiling app needs access to it directly (to the real video driver, not one running in the VM).

Nate