The physical colors are what the terminal configuration maps to. At least, modern terminals that I've used since the DOS era. Even back then, I had a tiny ut

The physical colors are what the terminal configuration maps to. At least, modern terminals that I've used since the DOS era. Even back then, I had a tiny utility that I used to set the EGA palette for different text-mode programs. Amberscale tones on a deep low-saturation blue was one of my favorites. Obviously won't help if you're using a teletype or punched cards or something like that.