Add a solarize filter. Solarization is an effect one can create manually on photo negatives by re-exposing a developed negative. We can simulate this by replacing each color component of each pixel that has a value v of less than 128 with 255 – v. The brighter components (value of 128 or more) we leave unchanged. (This is a very simple solarization algorithm—you can find more-sophisticated ones described in the literature.)
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