Point of pedantic graphic design: contemporary gay flag is six color whereas a rainbow is seven. Presence of an indigo stripe is the determining factor.
The Pink Floyd version was always using the gay color scheme.
We're generally talking about depictions in artwork and logos, where they have discrete bands. If we were discussing the continuous case, none of this conversation would have applied.
Point of pedantic graphic design: contemporary gay flag is six color whereas a rainbow is seven. Presence of an indigo stripe is the determining factor.
The Pink Floyd version was always using the gay color scheme.
Rainbows have either six colors, or infinite colors. Not seven.
If you count indigo, you also have to count red-orange, yellow-orange, yellow-green, blue-green, and violet-red, and that makes twelve colors.
EDIT: I let it slide with the Lantern Corps because they did something awesome with it.
We're generally talking about depictions in artwork and logos, where they have discrete bands. If we were discussing the continuous case, none of this conversation would have applied.
Nothing wrong with 12 colors, but less common.