Returns the colour CS and cs select along with this space.
public PdfColor GetInitialColor()
ISO 32000-2 §8.6.8, Table 73 and §8.6.4 to §8.6.6: 0 for DeviceGray, CalGray and Indexed, 0 0 0 for DeviceRGB and CalRGB, 0 0 0 1 for DeviceCMYK; for Lab and ICCBased each component 0 clipped into its range; 1.0 for every component of Separation and DeviceN; for Pattern, a colour with no pattern, which paints nothing.