virtualbox.org

Host: Linux Mint 19 (Cinnamon 3.8.9) Kernel 4.15.0-58-generic
Guest: Windows 7 Home Premium - 64 bits
Virtualbox 6.0.14 r133895 (Qt5.9.5)
VBoxGuestAdditios 6.0
2 Monitors - Graphic controller VBoxSVGA
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Hello,
Photoshop and others applications performs the colour management (at displaying on a device) through the "color profile" (.icc/.icm) assigned for that device in the operating system. It is done in "color management" option from the control panel of W7.
I have two monitors on my computer, however, the windows 7 color management features four "generic non pnp monitor. Virtualbox graphics adapter" in the devices list. Two of them are numbered as 1 | 2 and two others as 3 | 4. When i click on "identify monitors", one of my displays shows 1|2 and the other 3|4. ¿¿ ??
I have done several tests and concluded the following:
-When a color profile is assigned to one of the 1|2 monitor, it is automatically assigned to one of the 3|4 monitor, and the same for the other couple of 1|2 and 3|4 monitors.
-A color profile assigned to one of the couples (1|2 and 3|4) has an effect on my two displays, while a color profile assigned to the other couple (1|2 and 3|4) has no effect on any of my displays.
As a result both displays have always assigned the same profile, what is a problem. I want to have one profile assigned to one display and another different profile assigned to the other display.
I found this very confusing. Maybe i have a wrong configuration somewhere?
Any help would be appreciated.
Regards;

Hello,
I add some information. The device administrator only shows 2 monitors.

Please zip and post the guest's .vbox file from the guest's folder, using Upload Attachment. Also put in the zip file a guest log, from cold boot (not save-stated, to seeing the 1|2 3|4 monitor situation, to shutdown using the guest's Shutdown button.

Also, please pretend Virtualbox is not involved and google around to see why Windows may mark a monitor as 1|2. Perhaps a Microsoft forum. Please let us know what they say, I have never seen this kind of situation.

A Virtual Machine has a Virtual Monitor. There's no way for my VM to see that I have a FlexScan M1900 for example, so I'm a little bit skeptic that what you want to do will actually work.

Hello scottgut1,
Attached as requested.
Thank you in advance;

You do in fact have two monitors in your guest:

<Display controller="VBoxSVGA" VRAMSize="128" monitorCount="2"/>

I haven't found if there's anything in the log that shows how many monitors the host has. I seem to remember there is something but I can't remember it.

I have been trying to remember where I have seen that '1|2' designation, I think it's when a Windows host has two monitors and the second is set to mirror the first. Does Mint do that?

Can you please do a screenshot of the Mint screen arrangement dialog showing your host monitor setup?

Hello,
I don't have the screens in mirror mode. I have an extended desktop in both Mint and Windows setup.
It is amazing that when i click on "identify monitors" button in Color management screen windows shows 1|2 and 3|4, but when i click on "identify monitors" button in Display configuration screen, windows shows 1 and 2.

That's weird. I would not know how to solve this one. Can you apply the color corrections in the host Mint OS?

No, Photoshop (or any other application that performs color management) sends to every monitor the color numbers "translated" with the corresponding color profile of every monitor. For doing this, the application needs to know which is the color profile of every monitor from all installed in the system, so the application looks for the name of the color profile that the monitor has got assigned in the the "color management" configuration of the operating system. In this case Photoshop is running on W7 guest so it looks for the color profile in W7.
A different thing is the corrections done using LUT (Look Up Table) curves (obtained from monitor calibration) in the graphics card, these must be done in the host O.S because the guest O.S. can not access to the graphics card.
The sum of the corrections in LUT plus corrections based on device profile is usually called "full colour management".
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I guess I will have to settle for just one profile for both monitors.
Best regards;

I wonder if dual-boot might be better in this usage case?

I like to have both OS simultaneously but It is certainly an option that I have to value.
Regards;