3rd lesson - Perception Theory

These flashcards cover key concepts related to perception theory, color theory, and the psychological aspects of color as discussed in the lecture.

Visible Spectrum

The range of colors that can be seen by the human eye, including red, orange, yellow, green, blue, indigo, and violet.

Trichromatic Theory

A theory that suggests the human eye has three types of cones sensitive to red, green, and blue light, linking color perception to retinal physiology.

Additive Color Synthesis

The process of combining red, green, and blue light to reproduce any visible color.

Subtractive Color Mixing

A method where pigments absorb certain wavelengths of light, reflecting others, thus creating perceived colors.

Opponent-Process Theory

A theory proposing that color perception is controlled by opposing pairs: red-green, blue-yellow, and black-white.

Chromatic Contrast

A visual phenomenon where the color of one area affects how an adjacent area appears.

Negative Afterimage

A visual effect where staring at a color causes a perception of its complementary color when looking away.

Synesthesia

A neurological phenomenon where stimulation of one sense leads to involuntary experiences in another, such as seeing colors when hearing sounds.

Hue, Saturation, Brightness

Dimensions used to describe colors; Hue is the type of color, Saturation is the intensity, and Brightness refers to lightness or darkness.

Cultural Relativism in Color Naming

The idea that the way people describe colors can vary greatly between cultures and languages, influencing their perception.

Cones and Rods

Photoreceptor cells in the retina; cones facilitate color vision and detail in bright light, whereas rods are responsible for vision in low ($scotopic$) light levels.

Color Blindness (Deficiency)

A condition typically caused by the absence or malfunction of one ($1$) or more cone types, resulting in difficulty distinguishing specific wavelengths.

Color Constancy

The ability of the visual system to perceive the colors of objects as relatively stable despite changes in illumination and light source color.

Complementary Colors

Pairs of colors that sit opposite each other on a color wheel and, when mixed, produce a neutral color or create maximum visual contrast.

Simultaneous Contrast

A localized visual phenomenon where the background color shifts the perceived hue or lightness of a foreground object.

Metamerism

The occurrence where two different spectral power distributions appear to be the same color to an observer under a specific light source.

Purkinje Effect

The tendency for the human eye's peak sensitivity to shift toward the blue end of the spectrum as light levels drop.

Bezold Effect

An optical illusion where a color's perceived hue is changed by the induction of surrounding colors or neighboring patterns.