Wiktionary
desaturate
vb. 1 (context transitive of a colour English) To lessen saturation. 2 (context symptom intransitive English) Of the oxygen saturation level in a one's hemoglobin, to decrease; to drop.
Usage examples of "desaturate".
For a moment Yatima wondered if the clouds had been seared away, but as vis eyes desaturated and adjusted their response ve could see that the light was shining right through.
There was only one picture, an inane oil in desaturated colors, contrived so as to not look too much like anything.