Date: Thu, 14 Feb 2013 00:28:46 +0100 From: Ruud de Korte<ludwig@xs4all.nl>
A photographer is using Adobe Photoshop on Windows 7 via a Linux machine with a remote desktop connection. He calibrates his monitor with a Spyder on
I will assume the Windows machine is virtual and the guest on the Linux host, whth the later running natively.
Windows via the same Linux remote desktop. Is this the right way and what is he calibrating, the Linux graphic card or the virtual Windows CLUT? Because
He can set a profile with vcgt tag to test that. The xcalib project on http://xcalib.sf.net has such profiles. I guess neither.
Linux doesn't have CM on board, who is sending the color information to the monitor in the end? How reliable is this and does the same answer apply for
CM is possible on Linux with varying concepts and provided by several projects. Just ask bing. When he sets the profile inside the VM in Windows, then Photoshop is responsible for ICC conversion and any installed CMS on Linux should use sRGB as its monitor profile. If he uses a colour server on Linux, this one is responsible for the ICC conversion and the monitor profile in windows should be sRGB. He must then be careful to not do double colour correction, as the host and guest CMS'es can do colour calibration and probably ICC colour correction on their own. An other pitfall could be to try multi monitor support inside a guest system.
a VPN tunnel? Are there any virtual graphic drivers installed in a VPN environment?
Yes of course are there drivers. It is a computer, even if only virtual. But typical there is not much support for VCGT, but you can test it easily. hope this helps, Kai-Uwe Behrmann