Color

About Our Eyes

1. Complementary Color

White is all visible light mixing in equal proportion.
If some part of white light disappear, we will see another color.
Color we see and color which disappear are complementary color pairs.
In Munsell Color Cycle, the complementary color of a color is placed in opposite direction.

2. Afterimage

Positive Afterimage:
    The brightness and hue relationships of positive afterimages are about the same as those of the original images. When we turn off a bulb, we see a afterimage same as bulb in the short time of the bulb dying away.

Negative Afterimage:
    When retina receive certain light, it let receptors in our eyes decrease sensitivity. For example, we first see red, later see a white paper, we can see the complementary color of red because of less sensitivity to red.

3. Color Contrast

The contrast can talk in two aspect, Simultaneous Contrast and Successive Contrast.

(1) Simultaneous Contrast
When a color that is surrounded by another color, Simultaneous Contrast happens.

Example, Table 1

    The block in the center paint in the same green, but if the surrounding color is lighter than the color in the inside block, the color in the inside block will be darker, vice versa.

(2)Successive Contrast
Successive contrast happens when a given color is in one environment and then in another in quick succession. The color will be modified relative to these new surroundings.

Example, Table 2.