Soft proofing Monitor Gamut Warning is broken

Forum|Forum|6 days ago
May 30, 2026
4 replies
58 views

When Soft Proofing viewing the monitor gamut warning just change the entire display area to red. Note this also happened in 15.3. Destination gamut warning works correctly.

Windows 15.3.1 release, everything up to date.

Correct answer ShootingPixelsAndy

Culprit found. Windows Automatic Colour Management is silently turned on whenever the display is set to 10-bit. This clamps everything to sRGB and I guess upsets Lightroom in the process. Turning off ACM via Settings > System > Display > Colour Management restores correct gamut warnings but the other issue I previously reported of the image getting slightly dark remains.

ShootingPixelsAndyAuthorCorrect answer

Inspiring

Culprit found. Windows Automatic Colour Management is silently turned on whenever the display is set to 10-bit. This clamps everything to sRGB and I guess upsets Lightroom in the process. Turning off ACM via Settings > System > Display > Colour Management restores correct gamut warnings but the other issue I previously reported of the image getting slightly dark remains.

johnrellis

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@ShootingPixelsAndy Profile was created using Calibrite Profiler and works fine in 8bit.

If you set the profile to sRGB and use 10 bit, does the problem occur?

ShootingPixelsAndyAuthor

Inspiring

Yes.
2 different machines
2 different displays (desktop and laptop)
2 different graphics cards
10-bit always causes the issue.

Does 10-bit work for you? Anyone else?

Could it be related to a similar issue I reported 6 months ago with Soft Proofing?