However, for calculating accurate lighting and materials, you should always use gamma 2.2.

Any other gamma value would cause the render elements to be incorrect. This is because when compositing in Photoshop or After Effects the calculations are also done in linear space.

Firstly, the render elements must be saved in linear space. One incorrect setting could cause the composite not to match the intended beauty pass. There are a few settings that need to be set in Render to render out each element correctly. Open 3D World 0164 t_Q&A_164_Max-vray.max from the files accompanying this Q&A. Here, I’ll cover the necessary render elements that make up what’s commonly referred to as the beauty pass. You can tweak the intensity of a reflection, change the diffuse colour and even adjust light intensity.

By rendering out each of these elements as a separate image file, you’re able to control every property individually. Each element corresponds to a specific property, such as illumination, shadow, reflection and refraction. A complete rendered image is made up of various individual layers called render elements.

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