exposure

exposure - CS148: Introduction to Computer Graphics and...

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Page 1 CS148: Introduction to Computer Graphics and Imaging Exposure and Tone Reproduction CS148 Lecture 13 Pat Hanrahan, Winter 2009 Topics Perception of light intensities Camera exposure Exposure correction: levels and curves Creating a high dynamic range (HDR) image Displays and gamma HDR tone reproduction
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Page 2 Perception CS148 Lecture 13 Pat Hanrahan, Winter 2009 Real World = High Dynamic Range The relative radiance values of the marked pixels, clockwise from lower left: 1.0, 46.2, 1907.1, 15116.0, 18.0
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Page 3 CS148 Lecture 13 Pat Hanrahan, Winter 2009 Perception of Intensities 1. Sensation (S) vs. Intensity (I) Stevens Power Law: Sense Exponent Lightness 0.33 Smell 0.55 Loudness 0.60 Taste 0.80 Length 1.00 Heaviness 1.45 B = I 1 / 3 S = I p CS148 Lecture 13 Pat Hanrahan, Winter 2009 Perception of Intensities 1. Just-noticeable difference (JND) Weber’s Law 10% JND = Δ I I 0 . 01 For this reason, we sometimes say the eye’s Response is logarithmic (more accurately, obeys Steven’s Law)
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Page 4 CS148 Lecture 13 Pat Hanrahan, Winter 2009 Contrast = Max / Min 1. World:
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This document was uploaded on 01/12/2010.

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exposure - CS148: Introduction to Computer Graphics and...

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