Reference: pmSwapRGBComponents
pmSwapRGBComponents(pm, which) returns the pixmap pm with two of its RGB channels swapped. which is a two-character string specifying the channels by name: "R", "G, and "B". Example: pmSwapRGBComponents(pm, "rg")
pmSwapRGBComponents(pm, which) returns the pixmap pm with two of its RGB channels swapped. which is a two-character string specifying the channels by name: "R", "G, and "B". Example: pmSwapRGBComponents(pm, "rg")