Introduction to Color - Brown University

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CS123 | INTRODUCTION TO COMPUTER GRAPHICS Color Terms Hue distinguishes among colors (e.g., red, green, purple, and yellow) Saturation refers to how pure the color is, how much white/gray is mixed with it red saturated; pink unsaturated royal blue saturated; sky blue unsaturated Pastels are less vivid and less intense Lightness: perceived achromatic intensity of reflecting object Brightness: perceived intensity of a self-luminous object, such as a light bulb, the sun, or an LCD screen Can distinguish ~7 million colors when samples placed side-by-side (JNDs – Just Noticeable Differences) With differences only in hue, differences of JND colors are 2nm in the central part of visible spectrum and10 nm at extremes – non-uniformity! About 128 fully saturated hues are distinct Eye are less discriminating for less saturated light and less sensitive for less bright light Andries van Dam Color 26/57
CS123 | INTRODUCTION TO COMPUTER GRAPHICS Color Mixture The effect of (A) passing light through several filters (subtractive mixture), and (B) throwing different lights upon the same spot (additive mixture) A Color Mixing Applets Additive Mixing Applet: http://www.cs.brown.edu/exploratories/freeSoftware/repository/edu/brown/cs/explo ratories/applets/colorMixing/additive_color_mixing_guide.html B Combined Mixing Applet: http://www.cs.brown.edu/exploratories/freeSoftware/repository/edu/brown/cs/explo ratories/applets/combinedColorMixing/combined_color_mixing_guide.html Andries van Dam Color 27/57
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