duotone filter base

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Description
Evolution of a simple duotone filter.

First square is unfiltered,
second one is filtered to greyscale colours, third one has a colormatrix set "luminance to alpha",
4th one is superimposed on a white fill, resulting in an inverted greyscale appearance,
5th one has another luminance to alpha set, that is what it was all about.
As a result, the 6th one is using 2 flood fills and compositing, making up a duotone shading.
The last one has a component transfer filter primitive added, which you can use for fine tuning the look if you apply the filter on a photograph.
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