Namespace for colour handling and conversion functions.

Note there are 4 different ways to specify colours:
1. long colour values (entire colour expressed as a single long) - e.g. 0xFF00FF00
2. long component values (individual alpha, red, green, blue) - e.g. [255 234 0 101]
3. double colour values (individual alpha, red, green, blue) - e.g. [0.5 0.5 0.5]
4. Java Color instances - e.g. java.awt.Color/BLACK

Care should be taken to use the appropriate function. Typically:
1. Offers the best performance
2. Useful for manipulating 1.
3. Useful for high precision computations, or colours outside normal ranges
4. Useful for Java interop

Main namespace for imagez image processing functionality

Namespace that implements dithering functionality, using error diffusion.

Namespce for colour spectrum functions. These functions convert a double value from 0.0 to 1.0 to a 
long ARGB colour value.