Does "to adjust a red to a blue" mean to change the color of an object from blue to red?
Context:
"So when the 1960s came along, I was feeling split, schizophrenic; the war, what was happening to America, the brutality of the world. What kind of a man am I, sitting at home, reading magazines, going into a frustrated fury about everything – and then going home to adjust a red to a blue?"
Philip Guston interviewed by Jerry Talmer, ‘Creation is for Beauty Parlors’ The New York Post, April 9, 1977. Source.

