Lecture 4 - Color

Lecture 4 - Color - Chapter 4 Color is the property of...

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Chapter 4
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Color is the property of light. Where there is no light, there is no color. Opaque objects reflect whatever color they appear to be, and absorb all other colors. Transparent objects & substances divide light into one or more visible light waves.
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For example, a prism or rain (water-drops) divides white light or sunlight into rainbow colors or spectral colors The colors of the rainbow are spectral colors – their wavelengths fall into the visible electromagnetic spectrum
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Translucent materials and liquids that appear colored do not reflect light, but transmit certain wavelengths. When light is applied, the material only allows a certain color to spill through. (Like sunglasses or a Sports drink)
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To create colored light, color filters called gels are used. The gel subtracts from the white light of the bulb all colors except the color of the gel. Filters can also be used on the camera to tint the overall color of your movie or show.
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Color Perception Eye receives light of a certain wavelength or mixture of wavelengths which is transmitted & interpreted by the brain as a color sensation Lens of the eye focuses-light sensitive cells of the retina Cones-bright daylight vision, receive reflected light that make up color Rods- when there is little light, colorblind, can distinguish between the levels of brightness but not color
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1. Hue – describes the color itself: blue, red green, yellow, etc. Only spectral colors are pure hues. Colors on a TV screen or a computer monitor are created with only red, green, and blue (RGB)
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2. Saturation or Chroma is the strength or purity of a color. Represents the amount of white light or white, gray or black paint, mixed into hue High-saturated colors look rich Low-saturated colors look faded or washed out. Chromatic colors are colors with hue like red and blue.
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Lecture 4 - Color - Chapter 4 Color is the property of...

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