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Paul,
Any 24-bit RGB image is but three 8-bit grayscale images put together,
one per color channel. All you would need is a plugin or macro that
calls your required plugins over each channel individually, and then
reassembles the RGB image. You can generate such a plugin with the
macro recorder: open the Plugins/Macros/Record... , execute the
required operations over an example image, and then save and install
the macro.
Albert
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