{
  "date": "2026-09-29",
  "method": "Deterministic 375x525 RGB synthetic PNGs, no person or facial features; 150 DPI metadata; used only as test inputs. Files are not portraits and do not test the ERAS portal.",
  "checks": [
    {
      "file": "01-uniform-no-face.png",
      "format": "PNG",
      "width_px": 375,
      "height_px": 525,
      "bytes": 1750,
      "sha256": "46e2841f46acc799a4fbe2ed13722ff7af8041cbf1dcb8122e908fc4158298ff",
      "purpose": "Uniform bright field; verifies a centred brightness centroid can be reported even though no face exists."
    },
    {
      "file": "02-offcenter-patch-no-face.png",
      "format": "PNG",
      "width_px": 375,
      "height_px": 525,
      "bytes": 1782,
      "sha256": "54ec7eb79acdd860d0ee0dee47c3f7b6447dda6f61f6d5e488d185fd1d3deea5",
      "purpose": "Uniform dark corners and an off-centre bright patch; exercises the brightness-centroid proxy without depicting a face."
    },
    {
      "file": "03-gradient-no-face.png",
      "format": "PNG",
      "width_px": 375,
      "height_px": 525,
      "bytes": 1780,
      "sha256": "9ac8d5539bb291a365c1eb83d16bd85be9c821bfc54f150e9de50337eacd0e6f",
      "purpose": "A person-free left-to-right gradient; varies corner colours to exercise the background estimate."
    }
  ]
}