I was looking at the "remapping" table and it looks like the first 5 colors and the last 3 colors line up pretty well with the double hi-res graphics colors.

The gazelle software only seems to care about the 8 colors used for Videotex Viewdata. Maybe it doesn't use the other colors?

2 bits for blue, 3 for green, 3 for red

BGR
00 = 000 black
07 = 001 red
c0 = 100 blue
C7 = 101 b+r= magenta
38 = 010 green
00 = 000
FF = 111
C7 = 101
00 = 000
00 = 000
00 = 000
FF = 111
00 = 000
3F = 011 g+r = yellow
F8 = 110 b+g = cyan
FF = 111 white


I happened along a really cool spreadsheet regarding apple ii double-hi res and the 16 colors:

Apple II Video Display Theory

https://www.kreativekorp.com/software/fonts/apple2.shtml

https://docs.google.com/spreadsheets/d/1rKR6A_bVniSCtIP_rrv8QLWJdj4h6jEU1jJj0AebWwg/edit?usp=sharing