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Color

Color. Visible Light. The human eye sees light. Light is really a very fast electromagnetic wave. A wave is a sinusoidal repeating curve One nanometer (one billionth of a meter) = 10 Angstrom. What is. Pigment. from Latin pigmentum, from pingere, to paint .

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Color

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  1. Color

  2. Visible Light • The human eye sees light. • Light is really a very fast electromagnetic wave. • A wave is a sinusoidal repeating curve • One nanometer (one billionth of a meter) = 10 Angstrom

  3. What is Pigment • from Latin pigmentum, from pingere, to paint. • A setting used as or for coloring

  4. What is a Model? • An abstraction of reality • A schematic description of a system that accounts for its properties • A color model determines how pigments combine to produce color

  5. What is a Gamut? • A complete range or extent • Origin was musical instruments, meaning the range of notes an instrument makes. • So, it is the range of color available in a particular color space

  6. Hue Saturation • A single visible color, ranging from red through yellow, green, and blue, determined by the dominant wavelength of the light • The amount of gray in a particular color. More gray is less saturated, while a bright color, one with very little gray in it, is saturated

  7. What is a Shade is the mixture of a color with black, which reduces lightness

  8. What is a Tint is the mixture of a color with white, which increases lightness

  9. HSB Model • Based on the human perception of color • HSB stands for Hue, Saturation, Brightness • HSB model can be used to define a color on the Color palette or in the Color Picker dialog box • HSB is not usually a choice for creating or editing images

  10. L*a*b Model • Based on one luminance (lightness) component and two chromatic components • Largest number of colors available with greatest precision • Create all colors contained by other color models • Device-independent: colors will not vary, regardless of hardware

  11. What is a mode? • Mode is the manner, way, or method of doing something • Example: • Transportation mode: Car, Bus, Train, Plane • RGB 24 bit Color Mode • Red, Green, and blue each have 8 bits (28) for a total of 24 bits = 16,777,216 possible (224) colors

  12. Color Mode • L*a*b Mode • HSB Mode • RGB Mode • CMYK Mode • The color mode is used to determine which color model will be used to display and print an image

  13. Additive Color • Beams of colored light are mixed to form other colors. • No lightis BLACK • All lightis WHITE

  14. RGB • RGB is Red,Green,Blue • Based on Light (Additive) Color • 3 Primary lights’ brightness are combined to create a color • Color range is based on number of steps each light’s brightness can have. • Used for video and screen presentation

  15. Subtractive Color • When Light passes through a color filter, or reflected off a color surface, certain wavelengths are absorbed and others transmitted • All Colors absorbedis BLACK • No Color absorbedis White Magenta Yellow Cyan

  16. CMYK • CMYK is Cyan,Magenta,Yellow,blacK • Based on Reflected (Subtractive) Color • Dots of color are combined to create color in a Process • The process used and the size of the dot determine the resolution of the picture. • Used in printing

  17. Color Wheels • A circular chart that shows primary and secondary colors. CMY for printing RGB for Computers Primary colors: 3 colors at 60°, 180°, and 300°. Secondary colors: created using adjacent primary colors. 0°, 120°, and 240°. Tertiary color: created by using adjacent primary and secondary colors. 30°, 90°, 150°, 210°, 270°, 350°.

  18. Color Wheels • Older RYB Color Wheel • Still widely used Red, Yellow and Blue are used as primary colors.Orange, Green and Purple are secondary colors.

  19. Analogous Colors • A palette of compatible color combinations that blend well together. • Neighbors on the color wheel.

  20. Complementary Color • Colors opposite each other on the color wheel • They contrast, enhance and intensify each other. • Complementary colors need to be used with caution.

  21. Triadic Colors • Three colors, 120° apart on the color wheel. • High-Energy colors • Work well together • Often used in logos

  22. Color Psychology

  23. http://iit.bloomu.edu/vthc/design/additive.htm

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