https://wiki.povray.org/content/Reference:Image_Map#The_Filter_and_Transmit_Bitmap_Modifiers

I'm trying filter all and transmit all, and there is no observable filter or
transmit.

When I try filter 0, 0.99, I get

Parse Error: Keyword 'transmit' cannot be used with non color-mapped image.

So either I'm doing something very wrong, or this part of the code is _broken_,
or things have changed, and the documentation does not reflect this.

Can anyone verify / solve / workaround?

- BE

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