Color Theory & Programmable Pipeline

Color Theory

What is Color?

• Color is the brain's reaction to a specific visual stimulus
• 观察者的主观感知 subjective sensation experienced by the observer
• 取决于光的物理性质、与材料的交互、人类视觉系统和大脑对由此产生的现象的解读

1. Physics of Light

   • Wave Model or Particle Model

   • 通常使用particle model，认为光由光子构成

2. Properties of Light

   • \(E=hf\)

   • Photon behavior is cyclic and has a repeated pattern

   • \(\lambda=\dfrac{c}{f}\)

   • Each photon has a wavelength associated with it and the perceived color of light depends on this wavelength

   • 光强取决于present的photon数量

3. Spectral Energy Distribution Curve

   • Human eyes are sensitive to wavelengths in the range 330-770nm

4. Perception of Color

   • spectral sensitivity curves of cones: \(r=\int f(x)s(x)dx\)

Color Model

1. RGB
2. CMYK: Cyan/Maagenta/Yellow/Black
3. HSV: Hue/Saturation/Value

Programming Pipeline

• Programmable stage: vertex, assembly, fragment
• shader

GLSL

1. uniform variables: set by the program that can be changed at runtime, but are constant across each execution of the shader

2. attribute variables: properties of a vertex, input of vertex shader

3. varying variables:

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