COLOR is a physiological and psychological response to thewavelengths of light entering the retina.
VISIBLE LIGHT SPECTRUM•Situated between Infrared Light andUltraviolet Light•Consists of a spectrum of wavelengthsthat range from 700 nanometers to 400nanometers approximately•Also known as ROYGBIV or the ColorSpectrum•Each individual wavelength within thespectrum represents a color
DISPERSION – separation ofvisible light into differentwavelengths/colorsRED – longest wavelengthand lowest frequency in theColor SpectrumVIOLET – shortest wavelengthand highest frequency in theColor Spectrum
BLACK – absence of thewavelengths of the visiblelight spectrumWHITE – seen when all thewavelengths of thespectrum are perceivedby the eye ; combinationof all the colors in thespectrum
•As the light enters the eye, it strikes theretina which is lined with sensitive cellsknown as rods and cones.•Rods – sensitive to the intensity of light butcannot distinguish between the differentwavelengths•Cones – color-sensing cells of the retina;there are 3 type of cones, each sensitiveto a range of wavelengths in the spectrum
When a light wave strikes upon anobject, the different frequencies of light are either absorbed or reflected/transmitted. When can you tell when a frequency of light is absorbed or reflected/transmitted?
SELECTIVE ABSORPTION OF LIGHT:•Occurs when the frequency of the incident light is thesame as the frequency at which the atoms of the objectvibrate•When a frequency of light is absorbed, it is not seen orobserved in an object.•Objects have different colors because they containdifferent pigments which absorb one or morefrequencies of light. Ex. In a red object illuminated by white light, the OYGBIV components of the incident light is not observed. OYGBIV are the absorbed frequencies of light.
When the frequency of the incident light wave does not match thefrequency at which the atoms of the object move, reflection and transmission of light occurs.
Important components in determining the color of an object: • INCIDENT LIGHT • KIND OF PIGMENT IN THE OBJECT (or what colors are absorbed by the pigment)**As to why, this will be discussed further in the topic of Color Addition and Subtraction.
•Occurs when the frequency of the incident light is not the same as the frequency at which the atoms of the opaque object vibrate •The color of the object depends on thefrequency of the light wave that is reflected.Ex. In a red opaque object illuminated by white light, REDLIGHT is reflected and it is the color we perceive. OYGBIVwas observed therefore you cannot perceive it.
WHAT ABOUT BLACK AND WHITE OBJECTS?•When an object is black, all the colors of the spectrumare absorbed by pigment in the object.•When an object is white, all the colors of thespectrum are reflected and nothing is absorbed.
•Occurs when the frequency of the incident light is not the same as the frequency at which the atoms of the translucent/transparent object vibrate •The color of the object depends on thefrequency of the light wave that is transmitted. Ex. In a red glass illuminated by white light, RED LIGHT is transmitted through. OYGBIV was absorbed by the pigment in the glass.
Why is window glass colorless? - It transmits light of all visiblefrequencies and does not absorb any frequency of light.
- the process of adding two or more colors for production of a new color
White light is not only produced by combining all the frequencies of thecolor spectrum. White light can is also produced by combining theprimary colors of light: red, green, blue.
ADDITIVE PRIMARY COLORS OF LIGHT RED GREEN BLUE
When two primary colors of light: red, green, blue are added, secondary colors of light are produced. The secondary colors oflight are yellow, cyan and magenta.
SECONDARY COLORS OF LIGHTBLUE + GREEN = YELLOW BLUE + RED = MAGENTA BLUE + GREEN = CYAN
COMPLEMENTARY COLORS OF LIGHT -two colors of light (one primary, one secondary that together, in equal intensities produce white light -the complementary colors of light are magenta & green, cyan & red and yellow & blue.magenta + green cyan + red yellow + blue(red + blue) + green (green + blue) + red (red + green) + blue = white = white = white
-the process of determining the resulting color of an object throughsubtracting from the frequencies in incident light the frequencies thatare absorbed by the pigment in the object
Important components in determining the color of an object: • INCIDENT LIGHT • KIND OF PIGMENT IN THE OBJECT WHY?The kind of pigment of the object determineswhat colors it absorbs from the incident light. Thecolor that is not absorbed (or subtracted) is theresulting color.
SUBTRACTIVE PRIMARY COLORS OFLIGHT & PRIMARY COLORS OF PAINT YELLOW MAGENTA CYANabsorbs blue light absorbs green light absorbs red light
-when you add twosubtractive primarycolors, you get anadditive primary coloras a result- when you add allsubtractive primarycolors, you get BLACK
YELLOW MAGENTA CYAN-GREEN = RED -RED = BLUE -BLUE = GREEN-RED = GREEN - BLUE = RED -GREEN = BLUE•The color that •The color that •The color thatYELLOW LIGHT MAGENTA LIGHT CYAN LIGHTcan absorb is can absorb is can absorb isBLUE GREEN RED
Complementary Colors and Color Subtraction-the color of the light absorbed by a pigment is the complementaryColor of that pigment PIGMENT ABSORBS BLUE YELLOW ( RED & GREEN ) YELLOW ( RED & GREEN ) BLUE GREEN MAGENTA (BLUE & RED) MAGENTA (BLUE & RED) GREEN RED CYAN (GREEN + BLUE) CYAN (GREEN + BLUE) RED