Hi, I don't have the software so I can't directly help you. However I know a little bit about colors.
Usually colors are made up of three parts: red, green, and blue (or RGB) as you already know. Usually each of the three parts have a value from 0 to 255. To get white, you would set all three parts to a value of 255. To get black, you would set all three parts to a value of 0.
Other common values:
R=255, G=255, B=255 ----- White
R=0, G=0, B=0----- Black
R=255, G=0, B=0 ----- Red
R=0, G=255, B=0 ----- Green
R=0, G=0, B=255 ----- Blue
R=255, G=255, B=0 ----- Yellow
There's many RGB color charts. Do a search for them. Here's a few:
http/cloford.com/resources/colours/500col.htm
https
/www.rapidtables.com/web/color/RGB_Color.html