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Linearize working space and enable linear blendingIf you have enabled color management (by specifying a working color space), you can perform all color operations in linear light by linearizing the working color space. A linearized color space uses the same primaries and white point as the nonlinear version; the tone response curve for the linearized color space is just a straight line. (See Gamma and tone response.) If you have not enabled color management, you can still perform blending operations using a gamma of 1.0. By performing operations in a linear color space, you can prevent certain edge and halo artifacts, such as the fringing that appears when high-contrast, saturated colors are blended together. Many color operations benefit from working in a linear color space, including those operations involved in image resampling, blending between layers with blending modes, motion blur, and anti-aliasing. If you want to use a linearized working color space, do so when you set up the project, instead of switching later. Otherwise, colors chosen in the color picker will change when you switch to a linear working color space, because colors inside After Effects are interpreted to be in the working color space. Note: A linearized working
color space works best with higher color depths—16 bpc and 32 bpc—and
is not recommended for 8-bpc color.
 Choose File > Project Settings, and do one
of the following:
Additional resources about linear color spaces and linear blendingStu Maschwitz’s blog has several posts that are useful for learning about how, when, and why to work in a linear color space versus a non-linear color space. In this post, he lists several categories of color operations and whether they should be performed in a linear or non-linear working color space. On the ProVideo Coalition website, Mark Christiansen provides some examples of the results of enabling linear blending, as well as explaining a little more what linear blending means.
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