No filters required Duncan, but the processing is the same. In "Channel Mixer" reverse the Red & Blue channel settings.
i.e. In the red channel the setting would normally be 100 and blue 0. So reverse the settings and do the same in the Blue channel.
I also tweak the "Green & Constant" settings.
The major problem when using such as the Hoya filter is the very slow shutter speeds, often well below 1/25 sec (assuming your camera will work with a filter), so conditions would have to be perfect, slightest breeze and leaves on the trees would be OOF.
Full exif is embedded within the above photo, 1/60 @ f/14, ISO100 and this is on a very misty day with a very weak sun.
Harry
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