GROUP 3 ST. ANGELA - COLORS
-
Upload
fourangela -
Category
Education
-
view
789 -
download
2
description
Transcript of GROUP 3 ST. ANGELA - COLORS
REFLECT ORABSORB?
____ RED
____ ROY GIV
____ ROY GBIV
____ GREEN
____ ROY GBIV
YELLOW, CYANOR MAGENTA?
BLUE +
GREEN
BLUE +
RED
RED +
GREEN
What is COLOR?COLOR is a physiological and psychological response to the wavelengths of light entering
the retina.
VISIBLE LIGHTSPECTRUM
VISIBLE LIGHT SPECTRUM•Situated between Infrared Light and Ultraviolet Light•Consists of a spectrum of wavelengths that range from 700 nanometers to 400 nanometers approximately•Also known as ROYGBIV or the Color Spectrum•Each individual wavelength within the spectrum represents a color
DISPERSION – separation of visible light into different wavelengths/colors
RED – longest wavelength and lowest frequency in the Color Spectrum
VIOLET – shortest wavelength and highest frequency in the Color Spectrum
BLACK – absence of the wavelengths of the visible light spectrum
WHITE – seen when all the wavelengths of the spectrum are perceived by the eye ; combination of all the colors in the spectrum
How is color perceived by the eye?
•As the light enters the eye, it strikes the retina which is lined with sensitive cells known as rods and cones.•Rods – sensitive to the intensity of light but cannot distinguish between the different wavelengths•Cones – color-sensing cells of the retina; there are 3 type of cones, each sensitive to a range of wavelengths in the spectrum
•RED CONE – sensitive to the lower frequencies ROY
•GREEN CONE – sensitive to the middle frequencies
•BLUE CONE – sensitive to the higher frequencies
COLOR BY REFLECTIONAND
COLOR BY TRANSMISSION
When a light wave strikes upon an object, 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 the same as the frequency at which the atoms of the object vibrate•When a frequency of light is absorbed, it is not seen or observed in an object.•Objects have different colors because they contain different pigments which absorb one or more frequencies 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 the
frequency 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.
COLOR BY REFLECTION•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 the
frequency of the light wave that is reflected.Ex. In a red opaque object illuminated by white light, RED LIGHT is reflected and it is the color we perceive. OYGBIV was observed therefore you cannot perceive it.
WHAT ABOUT BLACK AND WHITE OBJECTS?•When an object is black, all the colors of the spectrum are absorbed by pigment in the object.
•When an object is white, all the colors of the spectrum are reflected and nothing is absorbed.
COLOR BY TRANSMISSION•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 the
frequency 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 visible
frequencies and does not absorb any frequency of light.
COLOR ADDITIONAND
COLOR SUBTRACTION
COLOR ADDITION
- 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 the color spectrum.
White light can is also produced by
combining the primary 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 of
light are yellow, cyan and magenta.
SECONDARY COLORS OF LIGHT
BLUE + GREEN = CYANBLUE + RED = MAGENTABLUE + GREEN = YELLOW
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
COLOR SUBTRACTION
-the process of determining the resulting color of an object through subtracting from the frequencies in incident light the frequencies that are 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 determines what colors it absorbs from the incident light. The color that is not absorbed (or subtracted) is the resulting color.
SUBTRACTIVE PRIMARY COLORS OF LIGHT & PRIMARY COLORS
OF PAINT YELLOW MAGENTA CYAN
absorbs blue light absorbs green light absorbs red light
-when you add two subtractive primary colors, you get an additive primary color as a result- when you add all subtractive primary colors, you get BLACK
YELLOW MAGENTA CYAN
-GREEN = RED-RED = GREEN
•The color thatYELLOW LIGHTcan absorb isBLUE
-RED = BLUE- BLUE = RED
•The color thatMAGENTA LIGHTcan absorb isGREEN
-BLUE = GREEN-GREEN = BLUE
•The color thatCYAN LIGHTcan absorb isRED
Complementary Colors and Color Subtraction
-the color of the light absorbed by a pigment is the complementaryColor of that pigment
PIGMENT ABSORBSBLUE YELLOW ( RED & GREEN )
YELLOW ( RED & GREEN ) BLUE
GREEN MAGENTA (BLUE & RED)
MAGENTA (BLUE & RED) GREEN
RED CYAN (GREEN + BLUE)
CYAN (GREEN + BLUE) RED