roeland wrote:What you are seeing here are artefacts of how Octane converts the RGB colours to a spectrum and back. The color coming back for the light source is not exactly red, but it will be slightly more magenta or yellow. And since the light source is much brighter than the maximum brightness displayed in the tone mapped image, it will get clipped to magenta or yellow instead of red. You can try a few things to improve the appearance:
You can set the color to not exactly red, but add a small amount of green or blue. This will make the color rendered for the light source clip consistently to yellow, magenta or white, depending on which colour you add.
You can also use a Gaussian colour instead. A wavelength setting of 0.850 and a width of 0.045 give a very saturated red, which will always clip to red if it is too bright.
Alternatively you can tweak the "saturate to white" input in the camera tone mapping settings. If you set it slightly above zero, very bright objects will tend to be displayed as white, so you also don't see the noise anymore.
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