On framebuffer consoles, OpenBSD uses the rasops(9) subsystem, which was imported from NetBSD in March 2001.
The RGB values for the ANSI color palette in rasops have been chosen to match the ones in Open Firmware, and are different from those in the VGA text mode color palette.
VGA text mode palette:
As one can see, the difference is quite significant, and decades of exposure to MS-DOS and Linux consoles makes it quite difficult to adapt to a different palette.
RGB values for the ANSI color palette are defined in sys/dev/rasops/rasops.c, and here are the proper ones to use to match the VGA text mode palette:
#define NORMAL_BLACK 0x000000 #define NORMAL_RED 0xaa0000 #define NORMAL_GREEN 0x00aa00 #define NORMAL_BROWN 0xaa5500 #define NORMAL_BLUE 0x0000aa #define NORMAL_MAGENTA 0xaa00aa #define NORMAL_CYAN 0x00aaaa #define NORMAL_WHITE 0xaaaaaa #define HILITE_BLACK 0x555555 #define HILITE_RED 0xff5555 #define HILITE_GREEN 0x55ff55 #define HILITE_BROWN 0xffff55 #define HILITE_BLUE 0x5555ff #define HILITE_MAGENTA 0xff55ff #define HILITE_CYAN 0x55ffff #define HILITE_WHITE 0xffffff
And here is a diff doing just that, which I sent to tech@ back in January 2017.