rtColor class matches all NotesColorObject properties and methods with following omissions:
No Hue, Luminance and Saturation properties as well as related setHSL method. rtLibrary allows to define colors only in RGB coordinates.
1) In case some object may contain a set of two blending (gradient) colors like
rtHRule there is an additional - AltColor (AltBlue, AltGreen, AltRed and setAltRGB) attributes that work the same way as base ones only referring to alternate (gradient) color.
2) For objects with one color gradient the gradient flag is stored along with color and is read-write accessible in rtLibrary.
3) Three highlighted text flavours are available in read/write mode.