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# Contrast and brightness functions like the knobs on

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Contrast and Brightness functions like the knobs on your TV set Input Image Scale Output Image Scale Increase Increase Slope Contrast Input Image Scale Output Image Scale Increase Increase Offset Brightness Contrast Knob Brightnesss Knob

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Increasing Contrast
How Contrast Functions Work Index into the Input Array of brightness (index = brightness) Get the corresponding brightness value from the Output Array What does this function do? Brightness Input Output 0 0 1 1 2 2 3 3 4 4 5 5 6 6 . . . . 255 255

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What would this function do? Brightness Input Output 0 8 1 9 2 10 3 11 4 12 5 13 6 14 . . . . 255 255
Increase Brightness

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What would this function do? Brightness Input Output 0 0 1 0 2 1 3 1 4 3 5 3 6 4 . . . . 255 255
Decrease Brightness

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Brightness and Contrast control Histogram thresholding Histogram stretching or equalization Color corrections Inversions Grayscale Transformations

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Histogram Thresholding thresholding creates a binary image by converting pixels according to a threshold value
Thresholding Demo Photoshop Image->Adjust->Threshold

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Brightness and Contrast control Histogram thresholding Histogram stretching or equalization Color corrections Inversions Grayscale Transformations
Histogram Stretching

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The Algorithm
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• Winter '08
• Morse,B
• Image processing, Brightness, Black-and-white, Binary image, Input Image Scale

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