When you do not want to burn in the gamma with color mapping, but you do want the sampler to use the gamma corrected image, you have to set gamma to 2.2, AND select this option. Since Vray 2.0, there is an extra option in color mapping: "don't affect colors (adaptation only)". Just remember that when you don't use the gamma 2.2 color mapping, you will need better sampling settings than when you do use it. With the color mapping technique, this image is already brighter during rendering so the sampler has less troubles identifying these lines. This is because the vray sampler is sampling these lines on an image that is in fact pretty dark (the post gamma 2.2 correction made it brighter).
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