The Book of Inkscape

10.2 Gradient Definition

Every gradient has a set of stops, each with its own color and transparency value. The minimum number of stops is the two end stops, in which case they apply to the ends of the gradient line (linear) or to the center and edges of an ellipse (elliptic). However, a gradient can also have any number of middle stops, each one having, along with its own color and transparency, a certain position between the end stops (for example, a middle stop may be at 0.5 of the gradient—that is, exactly in the middle between the end stops). For each gradient, the full set of its stops with their colors, transparencies, and positions is called the gradient definition.

Gradient definitions are document-wide resources. This means that any gradient ...