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OpenGL 4 Shading Language Cookbook

You're reading from   OpenGL 4 Shading Language Cookbook Build high-quality, real-time 3D graphics with OpenGL 4.6, GLSL 4.6 and C++17

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789342253
Length 472 pages
Edition 3rd Edition
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Authors (2):
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David A Wolff David A Wolff
Author Profile Icon David A Wolff
David A Wolff
David Wolff David Wolff
Author Profile Icon David Wolff
David Wolff
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Table of Contents (13) Chapters Close

Preface 1. Getting Started with GLSL FREE CHAPTER 2. Working with GLSL Programs 3. The Basics of GLSL Shaders 4. Lighting and Shading 5. Using Textures 6. Image Processing and Screen Space Techniques 7. Using Geometry and Tessellation Shaders 8. Shadows 9. Using Noise in Shaders 10. Particle Systems and Animation 11. Using Compute Shaders 12. Other Books You May Enjoy

Using gamma correction to improve image quality


It is common for many books about OpenGL and 3D graphics to somewhat neglect the subject of gamma correction. Lighting and shading calculations are performed, and the results are sent directly to the output buffer without modification. However, when we do this, we may produce results that don't quite end up looking the way we might expect. This may be due to the fact that computer monitors (both the old CRT and the newer LCD) have a non-linear response to pixel intensity. For example, without gamma correction, a grayscale value of 0.5 will not appear half as bright as a value of 1.0. Instead, it will appear to be darker than it should.

The lower curve in the following graph shows the response curves of a typical monitor (gamma of 2.2). The x axis is the intensity and the y axis is the perceived intensity. The dashed line represents a linear set of intensities. The upper curve represents gamma correction applied to linear values. The lower curve...

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