The IMAGE_COL menu block items specifies the color mode (COLO_SET) or colors to be applied in the subsequent IMAGE or COLOR atom commands.
The explicit colors "WHITE", "PINK", "RED", "ORANGE", "YELLOW", "GREEN", "GREEN_DA", "BLUE_LIG", "BLUE_DAR" define an color by index using MAIN_CMDS:image_color.cmds macro, where as the "COLOR_?? enables a user to provide his own color index through macro MAIN_CMDS:image_color_ask.cmds.
The IMAGE_COL menu block is loaded with the file MAIN_CMDS:load_image_col.com.