# L100 passage captures

Each route has paired L98 and L100 views at both mouths and at 25%, 50%, and 75% stations. The camera gate decodes each PNG and requires visible geometry (>3,000 pixels after excluding the dominant background color, with at least two RGB colors). Changed pixels count RGB pixels with any channel difference between a matched pair.

L100 source stamp: `7224bf6e668d06ed71a92f0857820e3ae2b0eca40574a491331ab5979a88f698`.

| View | L98 geometry px | L100 geometry px | Changed px | Images |
|---|---:|---:|---:|---|
| `0-1 · upper-mouth` | 1,063,522 | 1,063,522 | 41,441 | [L98](passage-0-1-0-upper-mouth-before-l98.png) / [L100](passage-0-1-0-upper-mouth-after-l100.png) |
| `0-1 · lower-mouth` | 1,420,316 | 1,420,316 | 23,644 | [L98](passage-0-1-0-lower-mouth-before-l98.png) / [L100](passage-0-1-0-lower-mouth-after-l100.png) |
| `0-1 · mid-25 (27.5%); station +50 m to surface; surface-target fallback` | 422,920 | 422,935 | 706 | [L98](passage-0-1-0-mid-25-before-l98.png) / [L100](passage-0-1-0-mid-25-after-l100.png) |
| `0-1 · mid-50 (50.0%)` | 1,375,241 | 1,375,118 | 20,082 | [L98](passage-0-1-0-mid-50-before-l98.png) / [L100](passage-0-1-0-mid-50-after-l100.png) |
| `0-1 · mid-75 (75.0%)` | 1,368,802 | 1,368,801 | 12,919 | [L98](passage-0-1-0-mid-75-before-l98.png) / [L100](passage-0-1-0-mid-75-after-l100.png) |
| `1-2 · upper-mouth` | 1,425,620 | 1,426,619 | 292,188 | [L98](passage-1-2-0-upper-mouth-before-l98.png) / [L100](passage-1-2-0-upper-mouth-after-l100.png) |
| `1-2 · lower-mouth` | 223,508 | 223,508 | 57,795 | [L98](passage-1-2-0-lower-mouth-before-l98.png) / [L100](passage-1-2-0-lower-mouth-after-l100.png) |
| `1-2 · mid-25 (25.0%)` | 1,409,914 | 1,409,907 | 15,713 | [L98](passage-1-2-0-mid-25-before-l98.png) / [L100](passage-1-2-0-mid-25-after-l100.png) |
| `1-2 · mid-50 (50.0%)` | 1,407,415 | 1,407,415 | 32,217 | [L98](passage-1-2-0-mid-50-before-l98.png) / [L100](passage-1-2-0-mid-50-after-l100.png) |
| `1-2 · mid-75 (75.0%)` | 1,261,589 | 1,264,705 | 263,048 | [L98](passage-1-2-0-mid-75-before-l98.png) / [L100](passage-1-2-0-mid-75-after-l100.png) |
| `2-3 · upper-mouth` | 60,506 | 60,506 | 0 | [L98](passage-2-3-0-upper-mouth-before-l98.png) / [L100](passage-2-3-0-upper-mouth-after-l100.png) |
| `2-3 · lower-mouth` | 60,257 | 60,257 | 0 | [L98](passage-2-3-0-lower-mouth-before-l98.png) / [L100](passage-2-3-0-lower-mouth-after-l100.png) |
| `2-3 · mid-25 (25.0%); surface-target fallback` | 631,345 | 631,345 | 0 | [L98](passage-2-3-0-mid-25-before-l98.png) / [L100](passage-2-3-0-mid-25-after-l100.png) |
| `2-3 · mid-50 (50.0%); surface-target fallback` | 629,698 | 629,698 | 4,208 | [L98](passage-2-3-0-mid-50-before-l98.png) / [L100](passage-2-3-0-mid-50-after-l100.png) |
| `2-3 · mid-75 (75.0%)` | 1,163,903 | 1,163,903 | 0 | [L98](passage-2-3-0-mid-75-before-l98.png) / [L100](passage-2-3-0-mid-75-after-l100.png) |

## Same-camera 1–2 regression check

The L99 and L100 midpoint records have identical focus, camera, target, yaw, and pitch. This three-version check decodes every image and passes the same geometry gate.

| Version | Image | Visible geometry px | Changed px from L98 |
|---|---|---:|---:|
| L98 | [before](../../Linux99/captures/passage-1-2-0-mid-tunnel-before-l98.png) | 1,407,415 | — |
| L99 | [flat-tunnel capture](../../Linux99/captures/passage-1-2-0-mid-tunnel-after-l99.png) | 1,206,362 | 1,135,959 |
| L100 | [fixed capture](passage-1-2-0-mid-50-after-l100.png) | 1,407,415 | 32,217 |

L99→L100 changed 1,134,150 pixels. The L100 view returns to the L98 image at this camera (L98→L100: 32,217).

All 30 L98/L100 PNGs passed the geometry gate. Capture logs, camera coordinates, exports, and raw metadata are under `Saved/Linux/l100/captures/`.