The B, N,F colors in a CPT

[PaulWessel]

Per the documentation, gmt makecpt will write out the B, N, F colors in the CPT have them. You can add -M to instead use the GMT Defaults settings COLOR_BACKGROUND, COLOR_NAN and COLOR_FOREGROUND. But, looks like we have an issue here. Here is the tail of share/cpt/SCM/roma.cpt:

...
0.984314        7/53/154        0.992156        5/51/153
0.992156        5/51/153        1.000000        3/49/152
N       255/255/255
B       126/23/0
F       3/49/152

If I ask for roma when building a CPT, I get

gmt makecpt -Croma -T2150/3050  | tail -5
3042.9413	7/53/154	3046.4702	5/51/153	L
3046.4702	5/51/153	3050	3/49/152	B
B	126/23/0
F	3/49/152
N	white

So that matches. Now, if you add -M we are supposed to get these defaults instead:

COLOR_BACKGROUND	= black
COLOR_FOREGROUND	= white
COLOR_NAN	 = 128

Try again:

gmt makecpt -Croma -T2150/3050  -M | tail -5
3042.9413	7/53/154	3046.4702	5/51/153	L
3046.4702	5/51/153	3050	3/49/152	B
B	black
F	white
N	128

OK, that is fine. How about this?

gmt makecpt -Croma -T2150/3050 -I --COLOR_BACKGROUND=black --COLOR_FOREGROUND=white --COLOR_NAN=128 -M | tail -5  
3042.9413	128/29/2	3046.4702	127/26/1	L
3046.4702	127/26/1	3050	126/23/0	B
B	white
F	black
N	128

Opps, despite setting the same values as the defaults, suddenly B and F are flipped. Seems like we have a bug in the parsing of those two settings?

Can any confirm we have an issue here?

[yvonnefroehlich]

gmt makecpt -Croma -T2150/3050 -I --COLOR_BACKGROUND=black --COLOR_FOREGROUND=white --COLOR_NAN=128 -M | tail -5  
3042.9413	128/29/2	3046.4702	127/26/1	L
3046.4702	127/26/1	3050	126/23/0	B
B	white
F	black
N	128

Opps, despite setting the same values as the defaults, suddenly B and F are flipped. Seems like we have a bug in the parsing of those two settings?

Can any confirm we have an issue here?

Hm. From the makecpt documentation, I understand that this flipping of background (B) and foreground (F) colors is expected when -I is used.

[PaulWessel]

Thanks @yvonnefroehlich you are absolutely right! I am losing it, obviously. Closing this silly issue.