Can't find a filter or an effect to "reduce blue"

[Dan64]

Hello Selur,

   the "RGBAdjust" is an Avisynth filter. In Vapoursynth this filter is missing, instead of there is the filter "Auto white",  but I'm not sure that the behavior is the same.
   If this is not the case, it could be possible to add a filter equivalent to "RGBAdjust"  in Vapoursynth  ?

Thanks
Dan