Counting colours sounds easy, but can be tricky, especially if you have shades, gradients or other complexities.
A simplistic way to get to grips with the colour count in your artwork is to think in terms of inks. For every shade or colour in your design, a different ink will normally need to be used. See the guide below to give you a feel for the options available.

If your design has more than 6 colours/shades, has gradients or is a photograph (even black and white photographs), you will need to select the full colour option.

See below for a few examples of print work and the required number of colours for print:

Please note, when asked for the number of print colours, this refers to the number of colours in your design work, not the garment colour.