Example experiment
Object-centred contrast study
Moving 3×3 contrast matrix
Rows change the black-point percentile; columns increase the asinh stretch. Every cell retains the original 322 × 456 pixel star scale.
Selected contrast video
Best score 0.969
Black point p1 (59 DN), white point p99.9 (207 DN), asinh strength 4. The diffuse-structure score improves by 1.7% over the calibrated object-centred source.
Measurements
The score compares faint multi-scale structure with temporal noise and penalises clipped highlights and shadows. It is a visibility aid, not a photometric quality measure.
| Variant | Score | Diffuse signal [DN] | Temporal noise [DN] | Clipped |
|---|---|---|---|---|
| black p0.2, asinh 1 | 0.952 | 8.04 | 8.35 | 0.25% |
| black p0.2, asinh 4 | 0.968 | 10.38 | 10.59 | 0.20% |
| black p0.2, asinh 12 | 0.955 | 9.88 | 10.22 | 0.20% |
| black p1, asinh 1 | 0.949 | 8.72 | 8.89 | 1.57% |
| black p1, asinh 4 | 0.969 | 12.11 | 12.16 | 1.25% |
| black p1, asinh 12 | 0.949 | 13.02 | 13.35 | 1.25% |
| black p3, asinh 1 | 0.923 | 8.92 | 9.13 | 3.08% |
| black p3, asinh 4 | 0.960 | 13.22 | 13.02 | 3.08% |
| black p3, asinh 12 | 0.947 | 15.74 | 15.70 | 3.08% |