Chapter 8 - Irradiation and Brightness-Contrast In Optical IllusionsStrange times are these in which we live, when old and young are taught in falsehoods school. And the one man that dares to tell the truth is called at once, a lunatic and fool. - Plato
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Chapter 8 - Irradiation and Brightness-Contrast In Optical Illusions

Many interesting and striking illusions owe their existence to contrasts in brightness. A dark line or spot will appear darker in general as the brightness of its environment is increased; or conversely, a white spot surrounded by a dark environment will appear brighter as the latter is darkened. In other words, black and white, when juxtaposed, mutually reinforce each other. The visual phenomenon of irradiation (the apparent enlargement of a bright object when viewed against a dark background) does not strictly belong to this group, but it is so closely related to it and so dependent upon brightness-contrast that it is included.

Many interesting and striking illusions owe their existence to contrasts in brightness. A dark line or spot will appear darker in general as the brightness of its environment is increased; or conversely, a white spot surrounded by a dark environment will appear brighter as the latter is darkened. In other words, black and white, when juxtaposed, mutually reinforce each other.

The visual phenomenon of irradiation (the apparent enlargement of a bright object when viewed against a dark background) does not strictly belong to this group, but it is so closely related to it and so dependent upon brightness-contrast that it is included.

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About This Book Preface Chap 1, Introduction Chap 2, The Eye Chap 3, Vision Chap 4, Geometrical Chap 5, Figures Chap 6, Angles Chap 7, Depth/Distance Chap 8 Brightness/Contrast Chap 9, Color Chap 10, Lighting Chap 11, Nature Chap 12, Painting/Decorating Chap 13, Architecture Chap 14, Magic Mirror Chap 15, Camouflage

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