Since version 1.0.7.0 there is an "extern Palette" choosable.
http://joe-c.de/pages/posts/version_1.0.0.0_-_1.4.3.2_194.php#V1_0_7_0
this can be a Picture like *.jpg or *.png, you just have to place the palette image in \TVisionData, select it and adjust the top and left offset, if your image has one.
I can implement so that the palette bar can be exported to that folder. I'll implement that in the next version.
I attached a demo palette file (Demo.ppg) (note: attached file extension chagned to .txt due to eevblog file restriction) and you can see if you will implement it.
It basically consists of a list of points with 4 values representing the temperature in percentage and it's color in RGB.
# is comment
Colorpara: %; red channel; green channel; blue channel;
Than all colors in between the range is calculated by linearizing it or scaling the values.
---- Example ----
# Linearization parameters
ColorPara: 0;30;30;30;
ColorPara: 5,6;67;19;106;
ColorPara: 11,1;0;0;160;
ColorPara: 16,7;0;0;250;
ColorPara: 22,2;5;95;250;
ColorPara: 27,8;5;160;250;
ColorPara: 33,3;16;243;243;
ColorPara: 38,9;5;220;160;
ColorPara: 44,4;4;198;96;
ColorPara: 50;4;179;0;
ColorPara: 55,6;95;210;0;
ColorPara: 61,1;156;223;0;
ColorPara: 66,7;250;235;0;
ColorPara: 72,2;250;160;10;
ColorPara: 77,8;245;120;0;
ColorPara: 83,3;243;10;16;
ColorPara: 88,9;145;0;0;
ColorPara: 94,4;245;195;230;
ColorPara: 100;245;245;245;
---- Example end -----
These parameters gives this palette