ND Filter Experiment — Final Package

Project page

Summary

This repo studies variable ND filters in the RAW domain.
We (i) measure transmission vs. nominal stops,
(ii) quantify color neutrality (ΔE*ab and channel ratios) under 3000K / 6000K,
and (iii) provide a fully reproducible pipeline.

Key findings

• Transmission closely follows T ≈ 2⁻ⁿ with small deviations at higher densities.
• Color neutrality drifts with density; warm vs. cool illuminants bias differently.
• All figures and CSVs are reproducible via scripts in code/.

Results (quick view)

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Package layout

• code/ — Python scripts
• data/ — CSV outputs
• figs/ — Figures
• roi/ — ROI overlays

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Requirements

• Python 3
• Install with:

python -m venv .venv && source .venv/bin/activate
pip install -r requirements.txt