toColorModel method
If this is a ColorModel, return this, otherwise construct
a new RgbColor from this Color.
Implementation
ColorModel toColorModel() =>
    this is ColorModel ? this as ColorModel : RgbColor.fromColor(this);If this is a ColorModel, return this, otherwise construct
a new RgbColor from this Color.
ColorModel toColorModel() =>
    this is ColorModel ? this as ColorModel : RgbColor.fromColor(this);