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As mentioned above, there is a backwards-compatible error metric called "contrast-v22". This is the metric that was used in RenderMan 22 and older: a relative contrast, with the contrast in dark pixels optionally reduced with "darkfalloff". (Note that the three new error metrics do not use "darkfalloff" since their gamma-weighted absolute differences have a similar effect.)
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Variance (left) versus Contrast (right) with the same settings
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Variance (left) versus Contrast (right) sample distribution visualized
Note the better concentration of samples using the Variance metric. However, more samples were taken and the image took 6 minutes longer. This is why it's recommended to increase the relative pixel variance control for similar render times.
Adaptive Sampling Tips
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For more help on image quality, see the documentation on Reducing Noise. |
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