OpenGL 4 Shading Language Cookbook - Third Edition

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The application of gamma correction is a good idea in general; however, some care must be taken to make sure that computations are done within the correct space. For example, textures could be photographs or images produced by other imaging applications that apply gamma correction before storing the data within the image file.

Therefore, if we use a texture in our application as a part of the lighting model and then apply gamma correction, we will be effectively applying gamma correction twice to the data from the texture. Instead, we need to be careful to "decode" the texture data, by raising to the power of gamma prior to using the texture data in our lighting model.

There is a very detailed discussion about these and other ...