Backlight Bleed Test

    Fullscreen fills use a bitmap canvas (not a styled div) for true black and gray levels, avoiding some GPU compositing / layer-edge artifacts.

    How to test

    1. Set brightness to your normal level
    2. Use View Fullscreen in a dim room; the frame is drawn with CanvasRenderingContext2D
    3. Scan corners and edges for lighter patches (bleed)
    4. Check off-axis warm haze (IPS glow)
    5. Use Uniformity for clouding / dirty-screen effect

    Backlight bleed: Light leaking from edges, usually corners

    IPS glow: Shifts with viewing angle — often normal on IPS

    Clouding: Uneven brightness / DSE on solid fields