The Meaning of “Color”
What’s an image?
- Irradiance: each pixel measures the incident light at a point on the film
- Proportional to integral of scene radiance hitting that point
What’s Color?
- Refers to radiance or irradiance measured at 3 wavelengths
- Scene color: radiance coming off of surface (for illumination)
- Image color: irradiance (for rendering)
- These quantities have different units and should not be confused