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I often found that the "Accessibility" group of effects are most useful because it is more useful than eye-candy.

I use the "color filter" effect everyday and What I liked most is the "Greyscale" and "Negative" color filter. Sometimes it may be more useful to have "Greyscale+Negative".

If this filter can be implemented I'd be all happy.

Or if anyone have any hint on how to start developing a new effect for kwin for myself?

Any chance? Thanks in advance.