I do know one way of getting those values, but they are based in index (or something...). You can have a table with a lot of different nominal/ordinal values and then set column property value colors with the theme you want. This will give a script like this
Data Table("Big Class"):name << Set Property(
"Value Colors",
{"ALFRED" = -13912408, "ALICE" = -4042310, "AMY" = -4354269, "BARBARA" =
-13400361, "CAROL" = -2668175, "CHRIS" = -10628061, "CLAY" = -12893483, "DANNY"
= -2600622, "DAVID" = -12921289, "EDWARD" = -9351208, "ELIZABETH" = -2661054,
"FREDERICK" = -13576604, "HENRY" = -9282864, "JACLYN" = -6995852, "JAMES" =
-1524612, "JANE" = -9458080, "JEFFREY" = -14452073, "JOE" = -6391856, "JOHN" =
-2745505, "JUDY" = -10199751, "KATIE" = -7150697, "KIRK" = -10513726, "LAWRENCE"
= -8381519, "LESLIE" = -3502441, "LEWIS" = -3615440, "LILLIE" = -13925307,
"LINDA" = -11502354, "LOUISE" = -7449196, "MARION" = -9229791, "MARK" = -4074344,
"MARTHA" = -13050224, "MARY" = -12565885, "MICHAEL" = -2068529, "PATTY" =
-4494272, "PHILLIP" = -11824110, "ROBERT" = -8734293, "SUSAN" = -13849421, "TIM"
= -13294235, "WILLIAM" = -1078076}
);
And I think those can be converted by using Color To RGB or Color To HLS
Names Default To Here(1);
dt = Open("$SAMPLE_DATA/Big Class.jmp");
Column(dt, "name") << Set Property(
"Value Colors",
{"ALFRED" = -13912408, "ALICE" = -4042310, "AMY" = -4354269, "BARBARA" =
-13400361, "CAROL" = -2668175, "CHRIS" = -10628061, "CLAY" = -12893483, "DANNY"
= -2600622, "DAVID" = -12921289, "EDWARD" = -9351208, "ELIZABETH" = -2661054,
"FREDERICK" = -13576604, "HENRY" = -9282864, "JACLYN" = -6995852, "JAMES" =
-1524612, "JANE" = -9458080, "JEFFREY" = -14452073, "JOE" = -6391856, "JOHN" =
-2745505, "JUDY" = -10199751, "KATIE" = -7150697, "KIRK" = -10513726, "LAWRENCE"
= -8381519, "LESLIE" = -3502441, "LEWIS" = -3615440, "LILLIE" = -13925307,
"LINDA" = -11502354, "LOUISE" = -7449196, "MARION" = -9229791, "MARK" = -4074344,
"MARTHA" = -13050224, "MARY" = -12565885, "MICHAEL" = -2068529, "PATTY" =
-4494272, "PHILLIP" = -11824110, "ROBERT" = -8734293, "SUSAN" = -13849421, "TIM"
= -13294235, "WILLIAM" = -1078076}
);
colors = Column(dt, "name") << Get Property("Value Colors");
color_aa = Parse(Substitute(Char(colors), "=", "=>", "{", "[", "}", "]"));
color_list = color_aa << get values;
Color To RGB(color_list[1]);
Color to HLS(color_list[1]);
Depending on the use cases you have, you might be able to write a script to do the color correction in graph builder. Other option would to be have data in such a format (stacked most likely), that you could have a column which you can use to determine the colors
-Jarmo