@jz beware that using #RGB is not enough to specify a color:
> A "#ColorModel" is an abstract mathematical model describing the way #colors can be represented as tuples of numbers (e.g. triples in #RGB or quadruples in #CMYK); however, a #ColorModel with no associated #MappingFunction to an absolute #ColorSpace is a more or less arbitrary color system with no connection to any globally understood system of color interpretation.
https://en.wikipedia.org/wiki/Color_space