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A general purpose high-pass filter plugin. It shows up as
Filters->Generic->High Pass Filter. You can select a blur radius that sets the
size of detail to be passed by the filter, a contrast adjustment, as well as an
option to keep the source layer or replace it.
It actually implements 5 different high pass modes:
1. Colour - I think this is the same as photoshop's high pass filter effect.
2. Preserve DC - like colour, but adds the average image colour back in.
3. Greyscale - this desaturates the layer before high pass filtering.
4. Greyscale, Apply Chroma - as above, but blends it in with the source
layer colours
5. Redrobes - (named after the technique described by Redrobes)
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