How visual grading works

Prepare an unsleeved card on a dark matte surface. The iPhone guides four short captures: front and back under ambient and raking light. Eight selected frames are rectified and uploaded privately. A multimodal model extracts visible observations; deterministic, versioned rubrics calculate a conservative BGT Grade. The result is a private two-page report.

1. Ambient front
2. Raking-light front
3. Ambient back
4. Raking-light back
5. Private two-page report