BoardRipper — HDR probe

HDR probe

Does a PQ-encoded image keep its headroom when composited over the board canvas?

…

force dynamic-range-limit: standard — tick this: if nothing dims, no HDR is happening at all

1. Plain white div
SDR reference

2. PQ image, standalone
must out-glow #1

3. Over a WebGL canvas
GATE — must match #2

4. Over canvas, opacity .6
GATE — must still glow

5. WebGPU extended
reference (Chromium only)

Intensity rungs

The glow is steady, not a pulse, so intensity is picked from the baked luminance ladder rather than modulated with alpha (alpha flattens HDR — see swatch 4). Which rung should be the default? Each sits over a WebGL canvas, as it will in the app.