Custom background color in fullscreen

Windows OS version

Windows 11 24H2

ImageGlass version

v9.3.2.520

ImageGlass release

Classic

1️⃣ Describe the feature

Allow using a different background color when the viewer is in fullscreen, possibly expanding to the toolbar. This is very useful on OLED displays, which are becoming more common in laptops. It could also just be a checkbox labeled: "Use black background in fullscreen", but more customization is always better!

Also, thank you so much for developing and maintaining this. It's only become more useful and valuable as Microsoft's built-in photo viewer becomes more cluttered, slow, and bloated. 😊

2️⃣ How to use feature

• In the appearance settings, there's simply another color swatch labeled "Fullscreen background color", that only affects the fullscreen mode. Here's an example of how it could be used:
• The traditional gray-ish transparent Mica color is used when the viewer is in a normal window.
• When the viewer enters fullscreen, the unused area around the image turns pitch black, which looks much better on OLED panels.

3️⃣ Additional context

No response

Start by locating the appearance settings and fullscreen viewer entry points, then check how the current background color is stored and applied. Done means fullscreen can use a separate configurable background color, while normal-window appearance remains unchanged; verify the behavior on Windows 11 with an OLED-oriented black setting.