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IES Caldern Gijn

Departamento de dibujo

ART 3 ESO Bilingual Section

COLOR THEORY

PHYSICS OF THE COLOR

THE ELECTROMAGNETIC SPECTRUM

The electromagnetic spectrum is more familiar to you than you might think. The microwave youuse to heat your food and the cell phones you use are part of the Electromagnetic Spectrum. The

light that our eyes can see is also part of the electromagnetic spectrum. This visible part of the

electromagnetic spectrum consists of the colors that we see in a rainbow - from reds and oranges,through blues and purples.

Waves in the electromagnetic spectrum vary in size from very long radio waves the size of

buildings, to very short gamma-rays smaller than the size of the nucleus of an atom.

Each of these colors actually corresponds to a different wavelength of light.

Visible light waves are the only electromagnetic waves we can see. We see these waves as thecolors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and

violet has the shortest wavelength. When all the waves are seen together, they make white light.

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When white light shines through a prism, the white light is broken apart into the colors of the

visible light spectrum. Water vapor in the atmosphere can also break apart wavelengths creating arainbow.

See Newton experiment with a prism:

dividing light into colors.

Newton's opposite demostration: adding colors

to get white light through fast rotation of a colorwheel.

Each color has a different wavelength.

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HOW DO WE SEE LIGHT AND COLORS?

Cones in our eyes are receivers for these tiny visible light waves. The Sun is a naturalsource for visible light waves and our eyes see the reflection of this sunlight off theobjects around us.

The color of an object that we seeis the color of light reflected. Allother colors are absorbed.

A black sweater is warmerbecause absorbs all the radiations(energy).

THE EYE

The retina anatomy.

The retina contains three types of color receptor cells, or cones, and one type of light-sensitive

cell,the rods.

http://en.wikipedia.org/wiki/Cone_cellhttp://en.wikipedia.org/wiki/Cone_cellhttp://en.wikipedia.org/wiki/Cone_cell

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Cones are divided into three types, each one specialized in one color:

One type, relatively distinct from the other two, is most responsive to light that we perceive as

violet.

The second type is most sensitive to light we perceive as yellowish-green.

The other type is most sensitive to light perceived as green.

The other type of light-sensitive cell in the eye, the rod, has a different response curve. In normal

situations, when light is bright enough to strongly stimulate the cones, rods play virtually no role invision at all.[6] On the other hand, in dim light, the cones are understimulated leaving only the

signal from the rods, resulting in a colorlessresponse.

Whe excited by light, these cells send messages to the brain. This organ elaborates the perception oflight and colors.

http://en.wikipedia.org/wiki/Rod_cellhttp://en.wikipedia.org/wiki/Rod_cellhttp://en.wikipedia.org/wiki/Color#cite_note-5http://en.wikipedia.org/wiki/Colorlesshttp://en.wikipedia.org/wiki/Colorlesshttp://en.wikipedia.org/wiki/Rod_cellhttp://en.wikipedia.org/wiki/Color#cite_note-5http://en.wikipedia.org/wiki/Colorless

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SUBTRACTIVE COLOR MIXING: CMY

A subtractive color model explains the mixing of paints,dyes,inks, and natural colorants to create

a full range of colors, each caused by subtracting (that is, absorbing) some wavelengths of lightand

reflecting the others. The color that a surface displays depends on which colors of the5electromagnetic spectrumare reflected by it and therefore made visible.

ADITIVE COLOR MIXING: RGB

An additive color model involves light emitted directly from a source or illuminant of some sort.

The additive reproduction process usually uses red, green and blue light to produce the other colors.

Combining one of these additive primary colors with another in equal amounts produces theadditive secondary colorscyan, magenta, and yellow. Combining all three primary lights (colors) in

equal intensities produces white. Varying the luminosity of each light (color) eventually reveals thefull gamut of those three lights (colors).

Computer monitors and televisions use a system called optical mixing and cannot be considered

additive light because the colors do not overlap. The red green and blue pixels are side-by-side.

When a green color appears, only the green pixels light up. When a cyan color appears, both greenand blue pixels light up. When white appears all the pixels light up. Because the pixels are so small

and close together our eyes blend them together, having a similar effect as additive light. Anothercommon use of additive light is the projected light used in theatrical lighting (plays, concerts, circus

shows, night clubs, etc.).

Mixing lights

Bayer pattern in a digital sensor

into a camera

http://en.wikipedia.org/wiki/Painthttp://en.wikipedia.org/wiki/Painthttp://en.wikipedia.org/wiki/Dyehttp://en.wikipedia.org/wiki/Dyehttp://en.wikipedia.org/wiki/Inkhttp://en.wikipedia.org/wiki/Inkhttp://en.wikipedia.org/wiki/Colorhttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Electromagnetic_spectrumhttp://en.wikipedia.org/wiki/Electromagnetic_spectrumhttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Redhttp://en.wikipedia.org/wiki/Greenhttp://en.wikipedia.org/wiki/Bluehttp://en.wikipedia.org/wiki/Primary_colorhttp://en.wikipedia.org/wiki/Secondary_colorhttp://en.wikipedia.org/wiki/Secondary_colorhttp://en.wikipedia.org/wiki/Cyanhttp://en.wikipedia.org/wiki/Magentahttp://en.wikipedia.org/wiki/Yellowhttp://en.wikipedia.org/wiki/Whitehttp://en.wikipedia.org/wiki/Whitehttp://en.wikipedia.org/wiki/Luminosityhttp://en.wikipedia.org/wiki/Gamuthttp://en.wikipedia.org/w/index.php?title=Optical_mixing&action=edit&redlink=1http://en.wikipedia.org/wiki/Painthttp://en.wikipedia.org/wiki/Dyehttp://en.wikipedia.org/wiki/Inkhttp://en.wikipedia.org/wiki/Colorhttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Electromagnetic_spectrumhttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Redhttp://en.wikipedia.org/wiki/Greenhttp://en.wikipedia.org/wiki/Bluehttp://en.wikipedia.org/wiki/Primary_colorhttp://en.wikipedia.org/wiki/Secondary_colorhttp://en.wikipedia.org/wiki/Cyanhttp://en.wikipedia.org/wiki/Magentahttp://en.wikipedia.org/wiki/Yellowhttp://en.wikipedia.org/wiki/Whitehttp://en.wikipedia.org/wiki/Luminosityhttp://en.wikipedia.org/wiki/Gamuthttp://en.wikipedia.org/w/index.php?title=Optical_mixing&action=edit&redlink=1

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CMYK PRINTING PROCESS

The CMYK color model (process color, four color) is a subtractivecolor model, used in color

printing, and is also used to describe the printing process itself. CMYK refers to the four inks used

in some color printing: cyan, magenta,yellow, and keyblack. Though it varies by print house,pressoperator, press manufacturer and press run, ink is typically applied in the order of the abbreviation.

The K in CMYK stands for key since in four-color printing cyan, magenta, and yellow printingplates are carefully keyed or aligned with the key of the black key plate. Some sources suggest thatthe K in CMYK comes from the last letter in "black" and was chosen because B already means

blue. However, this explanation, though plausible and useful as a mnemonic, is incorrect.

COLOR PSYCHOLOGY

Colors affect us in numerous ways, both mentally and physically. A strong red color has been shownto raise the blood pressure, while a blue color has a calming effect.

http://en.wikipedia.org/wiki/Subtractive_colorhttp://en.wikipedia.org/wiki/Color_modelhttp://en.wikipedia.org/wiki/Color_printinghttp://en.wikipedia.org/wiki/Color_printinghttp://en.wikipedia.org/wiki/Cyanhttp://en.wikipedia.org/wiki/Cyanhttp://en.wikipedia.org/wiki/Cyanhttp://en.wikipedia.org/wiki/Magentahttp://en.wikipedia.org/wiki/Magentahttp://en.wikipedia.org/wiki/Yellowhttp://en.wikipedia.org/wiki/Yellowhttp://en.wikipedia.org/wiki/Yellowhttp://en.wikipedia.org/wiki/Blackhttp://en.wikipedia.org/wiki/Blackhttp://en.wikipedia.org/wiki/Printing_presshttp://en.wikipedia.org/wiki/Printing_presshttp://en.wikipedia.org/wiki/Key_platehttp://en.wikipedia.org/wiki/Key_platehttp://en.wikipedia.org/wiki/Subtractive_colorhttp://en.wikipedia.org/wiki/Color_modelhttp://en.wikipedia.org/wiki/Color_printinghttp://en.wikipedia.org/wiki/Color_printinghttp://en.wikipedia.org/wiki/Cyanhttp://en.wikipedia.org/wiki/Magentahttp://en.wikipedia.org/wiki/Yellowhttp://en.wikipedia.org/wiki/Blackhttp://en.wikipedia.org/wiki/Printing_presshttp://en.wikipedia.org/wiki/Key_plate

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THE COLOR WHEEL

A color wheel is an abstract illustrative organization of colorhues around a circle, that show

relationships between primary colors,secondary colors,complementary colors, etc.

The first color wheel was designed by Sir Isaac Newton (see last page).

There are several models. Here you have some of them:

CLASSIC ARTIST RYB COLOR WHEEL AND COLOR STAR

CMY COLOR WHEEL: WE WILL USE THIS MODEL WITH OUR GOUACHES COLORS

http://en.wikipedia.org/wiki/Colorhttp://en.wikipedia.org/wiki/Huehttp://en.wikipedia.org/wiki/Huehttp://en.wikipedia.org/wiki/Primary_colorhttp://en.wikipedia.org/wiki/Primary_colorhttp://en.wikipedia.org/wiki/Secondary_colorhttp://en.wikipedia.org/wiki/Secondary_colorhttp://en.wikipedia.org/wiki/Complementary_colorhttp://en.wikipedia.org/wiki/Complementary_colorhttp://en.wikipedia.org/wiki/Colorhttp://en.wikipedia.org/wiki/Huehttp://en.wikipedia.org/wiki/Primary_colorhttp://en.wikipedia.org/wiki/Secondary_colorhttp://en.wikipedia.org/wiki/Complementary_color

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HUE

It is the pure color, its name.

TINT

A Tint is sometimes called a Pastel. It's simply

any color with white added.

SHADE

A Shade is simply any color with black added.

TONE

A Tone is created by adding both White andBlack. Any color that is "greyed down" is

considered a Tone.

Shade, tint and tone are terms that refer to a variation of a hue.

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Chroma: How pure a hue is in relation to gray.

Saturation: The degree of purity of a hue.

Intensity: The brightness or dullness of a hue. One may lower the intensity by adding white or

black.

Luminance / Value: A measure of the amount of light reflected from a hue. Those hues with a highcontent of white have a higher luminance or value.

PRIMARY COLORS

Colors at their basic essence;those colors that cannot be

created by mixing others.

In subtractive mixing, primary

colors are: CIAN, MAGENTAand YELLOW (CMY)

In aditive mixing, primarycolors are: RED, GREEn and

BLUE (RGB)

SECONDARY COLORS

Those colors achieved by amixture of two primaries.

Primary in one mixing aresecondary in the other!

TERTIARY COLORS

Those colors achieved by amixture of primary and

secondary hues.

COMPLEMENTARY COLORS

Those colors located opposite each other on acolor wheel.

ANALOGOUS COLORS

Those colors located close together on a colorwheel.

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WARM AND COOL COLORS