Can't resist to apply the enhanced color rules to
this particular set of narrow band channels:
673 nm ionized sulfur is a VIP channel
658 nm ionized nitrogen is a VIP channel
656 nm hydrogen alpha is a VIP channel
502 nm doubly ionized oxygen is a VIP channel
469 nm ionized helium is less important
373 nm ionized oxygen is less important
There are 5 source channels to spread evenly; 4 of them are VIPs and one is simply the shortest wavelength.
This five naturally maps to five RGB primaries:
RGB-red #ff0000 (630 nm, slightly orangish red)
RGB-yellow #ffff00 (570 nm, slightly orangish yellow)
RGB-green #00ff00 (532 nm, limish green)
RGB-cyan #00ffff (492 nm, slightly bluish cyan)
RGB-blue #0000ff (467 nm, violetish blue)
One channel then maps as to crowd with RGB-blue, not in the middle #0080ff, but to #0040ff.
Now there are brightness discriminations to apply:
673 nm ionized sulfur is a super VIP channel
656 nm hydrogen alpha is a sub VIP channel
469 nm ionized helium is not a VIP channel
373 nm ionized oxygen is not a VIP channel
So we have 4 levels of importance. Let's make them 4 none-zero levels of brightness:
ff A5 6E 37 00
These are total R+G+B brightnesses. So the result is:
super VIP 673 nm ionized sulfur to
███ RGB-red #ff0000 (630 nm, slightly orangish red)
just VIP 658 nm ionized nitrogen to
███ olive #525200 (570 nm, slightly orangish yellow)
sub VIP 656 nm hydrogen alpha to
███ dark RGB-green #006E00 (532 nm, limish green)
just VIP 502 nm doubly ionized oxygen to
███ teal #005252 (492 nm, slightly bluish cyan)
no VIP 469 nm ionized helium to
███ very dark cyanish blue #000B2C
no VIP 373 nm ionized oxygen to
███ very dark RGB-blue #000037 (467 nm, violetish blue)
Can't resist to apply the enhanced color rules to [url=http://www.astronomymark.com/hubble_palette.htm]this particular set of narrow band channels[/url]:
673 nm ionized sulfur is a VIP channel
658 nm ionized nitrogen is a VIP channel
656 nm hydrogen alpha is a VIP channel
502 nm doubly ionized oxygen is a VIP channel
469 nm ionized helium is less important
373 nm ionized oxygen is less important
There are 5 source channels to spread evenly; 4 of them are VIPs and one is simply the shortest wavelength.
This five naturally maps to five RGB primaries:
RGB-red #ff0000 (630 nm, slightly orangish red)
RGB-yellow #ffff00 (570 nm, slightly orangish yellow)
RGB-green #00ff00 (532 nm, limish green)
RGB-cyan #00ffff (492 nm, slightly bluish cyan)
RGB-blue #0000ff (467 nm, violetish blue)
One channel then maps as to crowd with RGB-blue, not in the middle #0080ff, but to #0040ff.
Now there are brightness discriminations to apply:
673 nm ionized sulfur is a super VIP channel
656 nm hydrogen alpha is a sub VIP channel
469 nm ionized helium is not a VIP channel
373 nm ionized oxygen is not a VIP channel
So we have 4 levels of importance. Let's make them 4 none-zero levels of brightness:
ff A5 6E 37 00
These are total R+G+B brightnesses. So the result is:
super VIP 673 nm ionized sulfur to [color=#FF0000]███[/color] RGB-red #ff0000 (630 nm, slightly orangish red)
just VIP 658 nm ionized nitrogen to [color=#525200]███[/color] olive #525200 (570 nm, slightly orangish yellow)
sub VIP 656 nm hydrogen alpha to [color=#006E00]███[/color] dark RGB-green #006E00 (532 nm, limish green)
just VIP 502 nm doubly ionized oxygen to [color=#005252]███[/color] teal #005252 (492 nm, slightly bluish cyan)
no VIP 469 nm ionized helium to [color=#000B2C]███[/color] very dark cyanish blue #000B2C
no VIP 373 nm ionized oxygen to [color=#000037]███[/color] very dark RGB-blue #000037 (467 nm, violetish blue)