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Color depth of display is incorrectly identified as 24-bit (color depth is visibly affected)

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Hi all,

I would like to know if this color issue is expected behavior or a bug somewhere on my system.

I am using a monitor (Acer ET322QK wmiipx) which displays color at a depth of 10 bits per channel (for a total of 30-bit color depth). When viewing images which have color depth exceeding 8 bits per channel, color banding is visible in Firefox that does not appear in GNOME Image Viewer, indicating that the image is not being displayed at the correct color depth. I've attached an image with 16 bits per channel color depth as an example. This sphere render is deliberately dim to make color banding more obvious. It should look smooth/unbanded on a display with support for colors with greater than 8 bits per channel.

By opening the Firefox console with Ctrl+Shift+K and entering "screen.colorDepth", I have confirmed that the display is identified by Firefox as having 24-bit color depth.

  1. System Details Report

---

    1. Report details

- **Date generated:** 2025-04-07 07:47:57

    1. Hardware Information:

- **Hardware Model:** ASRock B550 Phantom Gaming-ITX/ax - **Memory:** 32.0 GiB - **Processor:** AMD Ryzen™ 7 5800X × 16 - **Graphics:** AMD Radeon™ RX 5700 XT - **Disk Capacity:** (null)

    1. Software Information:

- **Firmware Version:** P3.40 - **OS Name:** Fedora Linux 42 (Workstation Edition Prerelease) - **OS Build:** (null) - **OS Type:** 64-bit - **GNOME Version:** 48 - **Windowing System:** Wayland - **Kernel Version:** Linux 6.14.0-63.fc42.x86_64

Hi all, I would like to know if this color issue is expected behavior or a bug somewhere on my system. I am using a monitor (Acer ET322QK wmiipx) which displays color at a depth of 10 bits per channel (for a total of 30-bit color depth). When viewing images which have color depth exceeding 8 bits per channel, color banding is visible in Firefox that does ''not'' appear in GNOME Image Viewer, indicating that the image is not being displayed at the correct color depth. I've attached an image with 16 bits per channel color depth as an example. This sphere render is deliberately dim to make color banding more obvious. It should look smooth/unbanded on a display with support for colors with greater than 8 bits per channel. By opening the Firefox console with Ctrl+Shift+K and entering "screen.colorDepth", I have confirmed that the display is identified by Firefox as having 24-bit color depth. # System Details Report --- ## Report details - **Date generated:** 2025-04-07 07:47:57 ## Hardware Information: - **Hardware Model:** ASRock B550 Phantom Gaming-ITX/ax - **Memory:** 32.0 GiB - **Processor:** AMD Ryzen™ 7 5800X × 16 - **Graphics:** AMD Radeon™ RX 5700 XT - **Disk Capacity:** (null) ## Software Information: - **Firmware Version:** P3.40 - **OS Name:** Fedora Linux 42 (Workstation Edition Prerelease) - **OS Build:** (null) - **OS Type:** 64-bit - **GNOME Version:** 48 - **Windowing System:** Wayland - **Kernel Version:** Linux 6.14.0-63.fc42.x86_64
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