Recently there's been a lot of excitement in the digital camera world
among former B&W film afficianodos who are simulating the use of colored
filters by manipulating color channels prior to converting a digital
image to greyscale.

Photoshop has a feature that lets you weight color channels when
you recompose them.

In Gimp, you can decompose color channels by:

    Image->Color->Decompose

and then later:

    Image->Color->Compose

I understand the function of weighting the channels is not there.

Is there some combination of existing functions that would let
you re-compose an image as:

    0% red, 50% green, 50% blue  (i.e., a red-blocking filter)

Is there some way to use blending of layers and opacity to do
this?  Or some other tools or scripts?
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