RGB/RGBA

interface RGBA {
  // "Red"
  readonly r: number
  // "Green"
  readonly g: number
  // "Blue"
  readonly b: number
  // "Alpha" or "opacity"
  readonly a: number
}

Represents a full Figma color value. These values are from 0 to 1. For example black is {r: 0, g: 0, b: 0, a: 1} and white is {r: 1, g: 1, b: 1, a: 1}.

interface RGB {
  readonly r: number
  readonly g: number
  readonly b: number
}

Represents a color just like RGBA but without an alpha value. This is only used for SolidPaint. Colors normally have an alpha value but all paints have an opacity value so alpha was redundant for SolidPaint.

All colors are specified in the same color space. This color space is sRGB in modern browsers and in the Figma desktop app is either sRGB or unmanaged depending on how you have it configured. Unmanaged means the color space is whatever the current color space is of your display.