A compare between two threshold filters. One uses component transfer in discrete mode, while the other is built from three component transfers with linear settings. Neither of them is rendered precisely but probably the one on the right should do the job better. Edit: there seems to be a bug with inkscape 0.91 making the thumbnail messed up. Works as described with 0.92.
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component transfer compare free icon was designed by Lazur URH for icons Png and presented to its users.
Lazur URH
2/7/2018