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Tone mapping in Maxwell Renders case refers to converting the spectral space render calculations into pixel values (color and brightness) so that the rendered image can be displayed on the screen. Here you have options available to control this conversion, including changing the color space and antialiasing sharpness.
The Tone Mapping adjustment panel
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Parameter that allows you control the anti aliasing filtering, producing a softer of sharper AA effect. It can be useful to minimize the moire effect seen in images that have fine repetitive lines, by lowering the sharpness, as too high sharpness can cause a flickering effect in animations in these cases. This feature is non destructive and can be edited at any time, even after the render has finished by simply loading an MXI file of the render and changing the Sharpness parameter. The default setting of 60 is good for most cases.