Description:
When HDR mode is enabled in Windows display settings, the tev window region becomes noticeably over-bright during screen clipping operations.
This happens with any screen clipping tool I’ve tested — including both the Windows Snipping Tool (Win + Shift + S) and Snipaste.

The over-bright effect only occurs during the frozen “region selection” phase (when the screen is dimmed for clipping). Once the clipping operation ends, tev returns to normal brightness. The clipped image also contains the over-bright tev region.

When HDR mode is disabled, this issue does not occur — the brightness remains normal throughout the clipping process.

Steps to reproduce:

• Enable HDR mode in Windows display settings.
• Launch tev.
• Start a screen clipping operation (e.g., using Windows Snipping Tool or Snipaste).
• Observe that during the frozen selection phase, tev’s window region appears over-bright.
• End the clipping operation — tev returns to normal.

Expected behavior:
tev’s brightness and color should remain consistent during screen clipping, regardless of HDR mode.

Actual behavior:
tev’s window region becomes over-bright only during the HDR clipping selection phase, and this over-brightness is reflected in the captured image.

System information:

• OS: Windows 11
• tev version: 2.5.2
• GPU: NVIDIA RTX 5090
• Display: HDR-enabled monitor

Additional notes:
This may be related to how Windows handles tone mapping and color space conversion during HDR screen captures. It seems the compositor applies different tone mapping to HDR surfaces when the desktop is frozen for clipping.