Display test patterns
SMPTE / RP-219 bars, PLUGE, greyscale, crosshatch, multiburst, overscan — drawn 1:1 in device pixels. Fullscreen + PNG.
Pick a pattern and go fullscreen on the target display; [ ] or arrow keys cycle patterns without leaving it. Geometry patterns are drawn in real panel pixels so 1 px stripes and checkerboards test native mapping; bars and PLUGE use video-range levels so sub-black is representable. Download 1080p / 4K (8K on confirm) for players that need a file. 8-bit sRGB SDR only — not an HDR, 10-bit or BT.2020 test.
Click the canvas or Fullscreen; Esc exits. The canvas is 8-bit sRGB SDR — it cannot test HDR, 10-bit gradients or BT.2020 gamut. Bars and PLUGE are video-range (16–235): on a full-range display black will read as dark grey by design.