Spectral rendering, part 3: Spectral vs. RGB
9 days ago
- #light-simulation
- #RGB-rendering
- #spectral-rendering
- Comparison between spectral and RGB rendering shows spectral rendering aligns more closely with physical reality.
- Spectral rendering uses illuminant spectra and reflectance spectra upsampled from sRGB, offering more accurate color reproduction.
- RGB rendering multiplies RGB triples component-wise, simplifying light interaction but diverging from physical accuracy.
- Illuminant E and D65 tests show minor differences between RGB and spectral rendering, with spectral rendering providing more nuanced color shifts.
- Spectral rendering handles monochromatic and spiky illuminant spectra more accurately than RGB, which struggles with color shifts and saturation.
- Gamut compression is a challenge for RGB rendering when dealing with out-of-gamut colors, whereas spectral rendering naturally handles such scenarios.
- Spectral rendering is beneficial for accurate color reproduction under varied illuminants and is increasingly used in production rendering.
- The blog advocates for spectral rendering due to its physical accuracy, despite the prevalence of RGB rendering in current practices.