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When an image snapshot fails, you get the number of pixels differing by more than the `threshold` you happened to configure — which doesn't tell you what threshold *would* have passed. So picking `SnapshotOptions::threshold` / `failed_pixel_count_threshold` is trial and error, one CI round-trip per guess. This measures the failing pixel count at a sweep of thresholds (new public `THRESHOLD_SWEEP`) and includes it in `SnapshotError::Diff`: ``` 'sweep_demo' Image did not match snapshot. Diff: 293, …/sweep_demo.diff.png. Failing pixels by threshold: 0.0: 1522, 0.1: 1522, 0.2: 293, 0.4: 293, 0.6: 293, 1.0: 293, … Run `UPDATE_SNAPSHOTS=1 cargo test --all-features` to update the snapshots. ``` The sweep only runs for snapshots that already failed, so passing tests are unaffected. Breaking: `SnapshotError::Diff` gained a `failing_pixels_by_threshold` field. * [x] I have followed the instructions in the PR template 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>